Knowledge about diabetic retinopathy, eye check-up practice and associated factors among adult patients with diabetes mellitus attending at debark hospital, Northwest Ethiopia
Routine eye examination plays a vital role in detecting diabetic retinopathy in its earliest stage before the onset of blindness. Patients’ knowledge about the nature and the consequences of diabetic retinopathy and routine eye checkup helps for timely identification and early treatment. However, there is limited evidence on knowledge of patients with diabetes mellitus on diabetic retinopathy and their eye check-up practices in Ethiopia.
The aim of this study was to assess knowledge about diabetic retinopathy, eye check-up practice and associated factors of diabetic retinopathy among adult diabetic patients at Debark hospital, Northwest Ethiopia.
Methods
Institution based cross-sectional study was conducted at Debark hospital, Northwest Ethiopia, from April 20/2018- May 20/2018. A pretested interviewer administered structured questionnaire was used to collect data among 230 diabetic patients aged 18 years and above. Data were entered in to Epi Info version 7 and exported to SPSS version 20 for analysis. Bivariable and multivariable binary logistic regression analyses were done. Odds ratio with 95% confidence level was determined and variables with p–value of < 0.05 were considered as statistically significant.
Result
Out of 238 sample 230 were participated, among this, 119 (51.7%) were males. The mean age of the respondents was 49 (SD ±17.6) years. One hundred nine (47.4%) participants had good knowledge and 91 (39.6%) had good eye check-up practice. Urban residence [AOR = 2.65;95% CI: 1.16–6.07)]), monthly income of 3501–8000 birr [AOR = 4.54;(1.31–15.7)], type II diabetes mellitus [AOR = 3.9;(1.6–9.6)], duration of diabetes (6–12 years [AOR = 4.4;(1.4–13.5)]), history of eye disease [AOR = 5.5;(2.3–13.0)] were associated with good knowledge. Similarly, longer duration of diabetes (13–25 years [AOR = 3.77; (1.05–13.5)]) and history of eye disease [AOR = 2.47; (1.09–5.62)] were associated with good eye check-up practice.
Conclusion
The proportion of good knowledge about diabetic retinopathy among diabetic patients at Debark hospital was fair (47.4%) and good eye check-up practice (eye examination at least once in the past year) was low (39.6%). Longer duration of diabetes and history of eye disease were identified as positive factors for good knowledge and eye check-up practice. Knowledge and regular eye check-up practice needs to be enhanced through provision of appropriate health education.
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Abkürzungen
AOR
Adjusted Odds Ratio
BMI
Body Mass Index
CI
Confidence Interval
DM
Diabetes Mellitus
DR
Diabetic Retinopathy
ETB
Ethiopian Birr
EPI INFO
Epidemiological Information
IQR
Inter quartile Range
SD
Standard Deviation
SPSS
Statistical Package for Social Sciences
Background
Diabetic retinopathy (DR) is defined as a damage to the micro vascular system of the retina, accompanied by structural changes in the retina due to a prolonged hyperglycemia [1, 2]. Worldwide, 34.6%(93 million) of diabetic patients are living with DR [3]. In 2007, Out of 39 million global blindness due to various eye diseases, 4.8% was due to DR [4].
Nowadays, diabetes mellitus (DM) [5] and DR [6] are becoming a public health concern in developing countries. Estimates of proportion of African patients with diabetes who are visually impaired are high even compared with older European Americans [7]. Loss of productivity and quality of life due to DR leads to socioeconomic burdens on the community.
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Routine eye examination is necessary for early detection of DR and prevention of blindness. This requires knowledge of sight threatening potential of DR and the need for regular eye examination. The knowledge and practice of regular eye cheek-up was reported as poor in developed countries [8]. This is expected to be worse in developing countries where most DM patients do not apply the recommended ocular examination aimed at preventing visual impairment and blindness from DR [9].
There are different factors which affects the knowledge and eye check-up practice of DR among diabetic patients [10, 11]. Sex being female [9, 12], longer duration of diabetes [13, 14] higher educational level [11, 13] and higher socioeconomic status [11, 15] were positively associated factors with good knowledge of DR. Older age [10, 11], language, ethnicity and residence being urban [16] were positively associated with good eye checkup practice.
Determining the level of knowledge, eye checkup practice and associated factors of DR will help as an input when the health authorities plan the prevention and elimination strategies of modifiable risk factors for poor knowledge and poor eye checkup practice. However, there is limited data regarding knowledge and eye cheek-up practice of DR among DM patients in Ethiopia. Therefore, this study was aimed to assess the knowledge, eye check-up practice and associated factors of diabetic retinopathy among adult diabetes mellitus patients attending diabetic follow-up clinic in Debark hospital.
Methods
Study design, setting and sampling
A hospital based cross sectional study was conducted to assess the knowledge, eye check-up practice and associated factors towards diabetic retinopathy among diabetic patients attending Debark hospital from April 20 to May 20, 2018, northwest Ethiopia.
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A total of 238 sample size was determined using Open Epi computer software with a single population proportion formula considering a total population of adult diabetic patients 485, which is the total number of adult diabetic patients with a routine follow-up at the diabetic follow-up clinic of Debark hospital. Since there is no data on the level of knowledge and eyecheckup practice for diabetic retinopathy among diabetic patients in Ethiopia p = 50% was taken and margin of error was 5%. The generated sample size was found to be n = 384. After correcting for a finite population the sample size was 216. Considering 10% for non-response rate the total sample size was 238.All adults with diabetes mellitus aged ≥18 years, attending at Debark hospital diabetic follow-up clinic were included in the study. By using systematic random sampling, and taking their card number order every other participant was selected to be a sample.
Operational definitions
Knowledge
Respondents who scored greater than or equal to the mean (≥5.55) of knowledge questions were considered to have good knowledge and those who scored below the mean were considered as having poor knowledge [5, 17].
Scoring
Participant’s knowledge of DR was assessed by 12 questions with a maximum score of 14 points. A numerical value of 1 for correct response and 0 for incorrect response was given.
Eye check-up practice
Participants who had ocular examination within the last 1 year were considered as having good eye checkup practice while those without any eye examination within the last 1 year were labeled as having poor eye checkup practice [9, 18].
Regular diabetic checkup
Participants who are undertaking investigations at least every 1 month since diagnosis of diabetes were considered as having regular diabetic checkup [5, 19].
Eye disease history
A participant who had experienced any type of eye diseases in the past 1 year.
Data collection tool and procedures
A structured face to face interviewer administered questionnaire was used to collect the data. The questionnaire was developed from Indian guideline for conducting a knowledge, attitude and practice study for diabetic retinopathy [20]. The questionnaire from the Indian guideline was pretested on 5% of the sample size outside the study area at Debre-Tabour general Hospital and was little modified to make it suitable to the study population. The validity of the questionnaire was assessed by cronbach’s alpha. The cronbach’s alpha result was 0.8. Data regarding knowledge about DR, eye check-up practices for DR, socio-demographic variables such as age, sex, income, marital status, education, religion, occupation, ethnicity, health profile variables such as type of DM, duration of diabetics and history of eye disease were collected. Questions in the knowledge section included definition, risk factors, screening for diabetic retinopathy and treatment options for diabetic retinopathy. Eye check-up practice was assessed by eye check-up behavior, referral and regular diabetic follow-up of the adult diabetic patients with regard to diabetic retinopathy.
Two trained optometrists and two ophthalmic nurses from Debark hospital staffs were involved in the data collection. One optometrist supervised the data collection procedure. The participants were informed that participation in the study is voluntary and the information gathered will be used for academic, policy making and other societal problem solving purposes. Patients who were willing to participate in the study gave a verbal consent.
Statistical analysis
After cleaning and coding, the collected data were entered to EPI info 7 and exported to Statistical Package for the Social Sciences (SPSS) version 20 for analysis. Both descriptive and analytical methods were used for analysis. Summary statistics, frequencies and cross tabulations were performed for the descriptive analysis of the data.
Binary logistic regression analysis was done to see the effect of independent variables on the dependent variables. Predictors with a P-value of ≤0.2 in the bivariable binary logistic regression were entered to the multivariable logistic regression analysis model by using enter method. The Hosmer-Lemshow goodness of fit statistic was used to assess whether the necessary assumptions for the application of multiple logistic regression were fulfilled. Multi co-linearity and reliability were checked using variation inflation factor and cronbach’s alpha respectively. The cronbach′s alpha scale was 0.8. Adjusted odds ratio with 95% confidence interval was used to determine the strength of the association and P-value less than 0.05 was considered as statistically significant.
Results
Socio-demographic characteristics of study participants
Two hundred thirty patients were participated in the study, giving a 96.68% response rate. The mean age of the participants was 49(±17.6) years. The median monthly income was 850 ETB [IQR of 500-3500ETB]. (Table 1).
Table 1
Socio-demographic characteristics of the study participants at Debark hospital, Northwest Ethiopia, 2018 (n = 230)
Variable
Frequency
Percentage
Sex
Male
119
51.7
Female
111
48.3
Age (year)
18–35
58
25.2
36–50
63
27.4
51–62
53
23.1
≥ 63
56
24.3
Residence
Rural
123
53.5
Urban
107
46.5
Religion
Orthodox
170
73.9
Muslim
60
26.1
Ethnicity
Amhara
213
92.6
Tigrie
17
7.4
Marital status
Single
51
22.2
Married
143
62.2
Divorced
12
5.2
Widowed
24
10.4
Occupation
Farmer
77
33.5
Private
54
23.5
Government employed
47
20.4
Housewife
32
13.9
Retired
20
8.7
Education
Can’t read and write
89
38.7
Can read and write
45
19.6
Elementary (1–8)
27
11.7
Secondary (9–12)
23
10.0
College and above
46
20.0
Monthly income (in ETB)
≤ 500
88
38.3
501–850
23
10.0
851–3500
59
25.6
3501–8000
60
26.1
n = sample size.
Health profile of study participants
The median duration of diabetes mellitus from the time of diagnosis was 5 years [IQR 3–12]. Eighty-three (36.1%) of study subjects had a history of previous eye disease (Table 2).
Table 2
Health profile of study participants at Debark hospital, Northwest Ethiopia 2018 (n = 230)
Variable
Frequency
Percentage
Type of DM
Type one
36
15.7
Type two
89
38.7
Don’t know
105
45.6
DM duration (years)
≤ 2
64
27.8
3–5
55
23.9
6–12
64
27.8
13–25
47
20.5
Hypertension
Yes
57
24.8
No
168
73.0
Don’t know
5
2.2
History of eye disease
Yes
83
36.1
No
147
63.9
Knowledge about diabetic retinopathy among study participants
The mean (+SD) knowledge score of study participants about DR was 5.55 (±4.66) with a maximum possible score of 14. One hundred twenty one [121 (52.6%)] participants had poor knowledge regarding diabetic retinopathy. Among those participants who had good knowledge about DR 25.6% were males and 33.9% were urban residents. One hundred sixty-seven (72.6%) of participants knew that diabetes affects the eye.
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The respective correct response on risk factors for DR for poorly controlled blood glucose level, long duration of DM, hypertension, high body mass index, smoking and pregnancy were 42.6, 36.6, 26.1, 21.3, 12.2, 2.2% respectively. One hundred nine (66.5%) participants knew the importance of regular eye checkup. Only 14 (9.3%) mentioned laser as a treatment option for DR (Table 3).
Table 3
Knowledge of diabetic retinopathy among diabetic patients at Debark hospital, Northwest Ethiopia, 2018
Variable
Frequency
Percentage
Does diabetes affect the eye? (n = 230)
Yes
167
72.6
No
63
27.4
Does diabetes cause blindness?
Yes
151
67.4
No
73
32.6
What Eye condition does diabetes cause? (n = 164)
Diabetic retinopathy
44
26.8
Cataract
31
18.9
Glaucoma
11
6.7
Don’t know
78
47.6
What are the risk factors for developing diabetic eye disease? (n = 164)
Poorly controlled blood sugar
98
59.8
Duration of diabetes
23
14
Hypertension
64
39
High BMI
12
7.32
Pregnancy
49
29.9
Smoking
77
47
I don’t know
23
14.02
Should a person with diabetes cheek his/her blood pressure?
Yes
132
80.5
No
8
4.9
I don’t know
24
14.6
Is blood sugar control important in preventing blindness from diabetic Retinopathy?
Yes
101
61.6
No
21
12.8
I don’t know
42
25.6
What is diabetic retinopathy? (n = 164)
It is the same as cataract
6
3.7
It is high sugars in the eye
16
9.8
Changes in the blood vessels of the retina
30
18.2
It is high pressure in the eye
3
1.8
Don’t know
109
66.5
Should a person with DM need eye screening? (n = 164)
Yes
117
71.3
No
2
1.3
Don’t know
45
27.4
How soon after the diagnosis need eye screening?
Immediately
56
51.4
One year
21
19.2
Five years
32
29.4
Does a patient with diabetes mellitus needs a regular eye checkup
Yes
48
29.3
No
83
50.6
I don’t know
33
20.1
Is diabetic eye disease treatable?
Yes
52
31.7
No
78
47.6
Don’t know
34
20.7
What treatment options are available for DR?
Medical
28
18.5
Laser
14
9.3
Surgery
20
13.3
Don’t know
88
58.7
Source of information about diabetic retinopathy
The major sources of information about diabetic retinopathy for the respondents were medical staffs from diabetic clinic and followed by their relatives or friends (Fig. 1).
Fig. 1
Source of information about diabetic retinopathy among diabetes patients at Debark hospital, Northwest Ethiopia, 2018 (n = 167)
×
Eye check-up practice of diabetic retinopathy
One hundred thirty-nine [139 (60.4%)] had poor eye check-up practice regarding diabetic retinopathy. Among those who examined their eyes 65.6% reported that they got dilated fundus examination (Table 4).
Table 4
Eye check-up practice of diabetic patients at Debark hospital, Northwest Ethiopia, 2018 (n = 230)
Variable
Frequency
Percentage
Have you ever been referred to check your eyes?
Yes
97
42.2
No
133
57.8
Have your eyes been examined?
Yes
95
41.5
No
134
58.5
How many times have your eyes been examined in the last one year? (n = 95)
None
4
4.2
Once
56
58.9
Twice
24
25.3
3 times
11
11.6
How often did you check your blood sugar level?
Monthly
177
77.0
Every two months
40
17.3
Every three months
13
5.7
The reasons for not getting eye checkup were reported as lack of visual symptoms (didn’t think it necessary) in 56.7% of participants and followed closely by 32.1% who felt they needed to be referred by their physician before getting their eyes examined and lack of convenient facility in 11.2% of participants.
Factors associated with knowledge of diabetic retinopathy
Age, religion, residence, ethnicity, occupation, education, monthly income, type of DM, duration of DM from diagnosis and previous eye disease were significant from the bivariable analysis and entered in to multivariable analysis. The result of the multivariable binary logistic regression analysis showed that, the odds of good knowledge among participants from urban was 2.6 times (AOR =2.65, CI: 1.16–6.07) more as compared to those from rural area. Similarly, the odds of good knowledge among participants who had monthly income of 3501–8000 ETB was 4.5 times (AOR = 4.54, CI: 1.31–15.7) more as compared to those who had ≤500 ETB monthly income. The odds of good knowledge among participants having a diabetes duration of [6–12] years was 4.4 times (AOR = 4.42, CI: 1.44–13.5) more as compared to participants having a DM duration of ≤2 years. The odds of good knowledge among participants who had previous eye disease was 5.5 times (AOR = 5.5, CI: 2.3–13.0) more as compared to those who hadn’t it (Table 5).
Table 5
Factors associated with knowledge of diabetic retinopathy at Debark hospital, Northwest Ethiopia, 2018 (n = 230)
Factors associated with eye check-up practice of diabetic retinopathy
Age, residence, marital status, occupation, educational level, knowledge of type of DM, monthly income, duration of DM, previous eye disease and knowledge of DR were significant on bivariable binary logistic regression model. In the multivariable binary logistic regression analysis duration of DM, previous eye disease and knowledge of DR were significantly associated with good eye checkup practice. The odds of good eye check-up practice among participants with a diabetes duration of [13–25] years was nearly 4 times (AOR = 3.77, CI: 1.05–13.5) more as compared to participants with a DM duration of ≤2 years. The odds of good eye check-up practice among participants having previous eye disease was 2.4 times (AOR = 2.47, CI: 1.09–5.62) more as compared to those who hadn’t it. The odds of good eye checkup practice among participants who had good knowledge of DR was 17 times (AOR = 17.5, CI: 5.97–51.3) more as compared to those who had poor knowledge (Table 6).
Table 6
Factors associated with eye checkup practice of DR at Debark hospital, Northwest Ethiopia, 2018
In this study 47.4% [95% CI: 41.7–53.9%] of study participants had good knowledge regarding diabetic retinopathy. This result is in line with the study done in India [21] which was reported as 47%. However, the result in this study is lower than the studies conducted in Bangladesh [17] and Saudi Arabia [22] which were 76 and 64% respectively. This difference might be due to lack of organized diabetic education facilities, less participation of media and non-governmental organizations in awareness creation about diabetic retinopathy in present study setting.
One hundred sixty-seven (72.6%) [95% CI: 67.0–78.4%] study participants thought that diabetes affects the eye which is consistent with the study done in India [6], Saudi Arabia [12] and Nigeria [23] which were reported as 74.3, 75.6 and 69.9% respectively. This might be due to similarity in the study design and setting. In Contrary, this is lower than the study conducted in Malaysia [24], South Africa [25] and Kenya [26] which were reported as 87.2, 97.3 and 83% respectively. This difference might be due to the study participants in Malaysia and South Africa were patients from retina clinic who came for routine eye examination and they might have more exposure on DR information.
In this study 44 (26.8%) participants were able to mention diabetic retinopathy as a complication of DM and 30 participants (18.3%) defined diabetic retinopathy correctly. This result is lower than the study reported in Bangladesh [17] which was 55%. It might be due to limited source of information and inadequate involvement of the media in the present study.
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Knowledge on risk factors like poor control of blood glucose level was 42.6% and longer duration of DM was 36.6%, this finding is higher as compared to a study done in India [6] which were reported as 33.7 and 17.9% respectively. This could be due to variation in the level of information given by the physicians on risk factors and their consequences.
In this study one hundred-nine (66.6%) study participants realized the importance of regular eye check-up. This finding is consistent with a study done in Nigeria [13] which was 66.9%. Knowledge on treatment option of DR was very low, only 14(9.3%) participants knew laser as a treatment option for DR. This result is comparable to a similar study done in India [6] where 4.7% of participants mentioned laser as treatment option. This might be due to knowledge on treatment of DR most likely acquired from eye clinic environment rather than DM follow up clinic.
This study also showed that 39.6% [34.3–45.7%] of participants had good eye checkup practice regarding diabetic retinopathy and 60.4% of participants had poor eye checkup practice regarding DR. This finding is in line with the study done in South Africa [25] and Bangladesh [17] where the practice of eye examination was reported as 37% in both studies. On the other hand, the result from the present study is lower than the result obtained from Australia [27] [71%], Malaysia [24] [50%], Ghana [9] [65.4%], Kenya [26] [50%]. This could be due to variation in socio-demographic characteristics and low access to health care in the present study. In contrast, the result from this finding is higher than the result reported from India [21] [21.6%] and Pakistan [25.6%]. This could be explained by the variation in study design and target population where the study done in Pakistan was a comparative population-based study.
The reasons for not getting eye examination were lack of visual symptoms in 56.7% participants and followed by 32.1% who felt they needed to be referred by their physician before getting their eyes examined. This result is consistent with the finding reported from Nigeria [23]. This is explained by poor perception of participants about the need for regular eye examination.
According to this study the odds of good knowledge among urban residence participants was 2.6 times more as compared to those from rural residence. This is supported by a study conducted in Bangladesh [28]. This could be explained by people living in urban have multiple source of information to know about diabetic retinopathy; health centers, mass media and higher people interactions than those live in rural.
Higher monthly income level was significantly associated with good knowledge in the present study. This finding is consistent with studies done in India [11, 15], where good knowledge was positively associated with higher socioeconomic status. The possible explanation for this finding could be people with high income level might have more exposure to Medias and inter personal interaction than those who had low income level.
It is also indicated that study participants who knew the type of DM diagnosed were more knowledgeable regarding diabetic retinopathy than those who didn’t know.
This study had revealed a positively association between long duration of DM and good knowledge of diabetic retinopathy. This finding is supported by studies conducted in Nigeria and Iran [13, 14]. This could be due to frequent contact of the participants with the health care provider which creates opportunity to get information regarding diabetes complications.
History of eye disease at least once in their life was significantly associated with good knowledge about DR in this study. This might be due to the health education given for patients coming for eye examination help them to acquire some basic knowledge about the disease.
In the previous studies, sex [9, 12] and age [12, 14] were significantly associated with knowledge of DR. However, in the present study sex and age were not significantly associated with knowledge of DR. In this study educational level didn’t significantly associated with knowledge. In contrast, educational level was significantly associated with knowledge of DR in a studies done in Nigeria and India [11, 13]. This might be due to variation in study participants’ characteristics, where most of the study participants were illiterate in present study and this could mask the significance of educational level in present study.
Longer duration of DM was positively associated with good eye checkup practice in the present study. This is supported by a study conducted in Bangladesh [28] and India [29]. This might be due to as the disease duration increases their knowledge to eye screening increases as evidenced by the association of knowledge and disease duration. This might be also due to continued counseling and health education programs.
Good knowledge of diabetic retinopathy was significantly associated with good eye check-up practice. This result is supported by the studies conducted in Ireland [18], Bangladesh [17] and Ghana [9]. This might be due to having a good knowledge creates a firm belief in need for annual eye check-up and as showed the major reason for poor eye check-up was the wrong perception of eye screening needed only if there is a visual symptom.
The odds of good eye check-up practice among participants who had history of previous eye disease was 2.4 times more as compared those who hadn’t it. This finding is supported by a study conducted in Ireland [18]. This might be due the fact that most patients go for eye examination if they develop a visual symptom.
In previous studies age [10, 11] and ethnicity [16] were significantly associated with eye check-up practice. However, the data in the current study didn’t support this. This variation might be due to difference in study design, because the study done in United Kingdom used qualitative study design and also it might be due to small number of cases in the present study.
Over all, even though this research provides information regarding knowledge, eye checkup practice and associated factors of diabetic retinopathy among adult diabetic patients attending diabetic follow-up clinic at Debark hospital in Northwest Ethiopia, it has the following limitations. Some questions like history of eye disease may be forgotten by the participant so that it might be affected by recall bias. More over eye checkup practice may be affected by attitude of patient, which this research doesn’t address the attitude of the participants towards eye check up practice.
From the findings of this study we recommend the national, regional, zonal and Debark Hospital health authorities to set a guideline that includes advice for diabetic patients about diabetic retinopathy as one component of the standard treatment guideline. More over it is better if the national regional and zonal mass media and the hospital coordinator set a regular time to deliver education about diabetic retinopathy and other diabetic complications with the aim of improving the knowledge and eye checkup practice of patients with diabetes mellitus. Other factors that affect diabetic retinopathy including blood pressure control, glycemic control and lipid control shall be the components of patient education. We also recommend future researchers to conduct further studies on knowledge about diabetic retinopathy and eye check-up practice among adult diabetic patients including the participant’s attitude and other health aliments in a multicenter setting with a larger size population.
Conclusions
In conclusion, finding from this study revealed a good knowledge on nearly half (47.4%) of study participants and good eye check-up practice on more than one third (39.6%) of study participants regarding diabetic retinopathy among diabetes mellitus patients attending debark hospital, Northwest Ethiopia. Being urban resident, higher monthly income, knowledge of type of DM diagnosed, history of eye disease and longer duration of diabetes were the factors positively associated with good knowledge of participants. Similarly, factors associated with good eye checkup practice were longer duration of diabetes mellitus, previous eye disease and good knowledge of diabetic retinopathy.
Acknowledgements
We would like to acknowledge the Debark hospital and all study participants for their cooperation and willingness to participate in this study.
Ethics approval and consent to participate
The study was conducted in accordance with the ethical Declaration of Helsinki and approved by the University of Gondar Institutional Review Board. Ethical clearance was obtained from the University of Gondar, college of medicine and health sciences school of medicine ethical review committee. The ethical review committee read the proposal and they believed that, the data collection process have no harm on the participants of the study and permitted the researchers to collect data with informed verbal consent only. The data were collected by using interview administered structured questionnaire and also there was no invasive examination procedure done on the participants for the sake of this research. Thus, after explaining the purpose and importance of the research, informed verbal consent was obtained from each respondent. Every participant had a full right to or not to participate in this research. For the sake of confidentiality the respondent’s name and personal identity were not asked and recorded on the questionnaire. After collecting the data every participant was advised to visit the eye care unit for ophthalmic evaluation. The data is securely locked so that no one can access it except the researchers.
Consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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Knowledge about diabetic retinopathy, eye check-up practice and associated factors among adult patients with diabetes mellitus attending at debark hospital, Northwest Ethiopia
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