Review Article - Journal of Public Health Policy and Planning (2021) Volume 5, Issue 6
Public awareness and knowledge of factors associated with myopia in kisumu county, western Kenya.
- Corresponding Author:
- Dr. Shadrack Muma
Department of Public Health Maseno University
Accepted date: 15 May, 2021
Citation: Muma S, Obonyo S. Public awareness and knowledge of factors associated with myopia in kisumu county, western Kenya. J Public Health Policy Plann. 2021;5(6):1-5.
Introduction: Myopia is a global public health priority. Many modifiable and non-modifiable risk factors have been shown to influence the development of myopia, but these factors are not adequately known by the general public. This study assessed public awareness of the factors that are associated with myopia among the general population in Kisumu County, Kenya. Background: A cross-sectional study was conducted using an Internet-based questionnaire. We collected basic socio demographic characteristics and investigated participants’ knowledge of risk and protective factors that are associated with myopia. The primary outcome measures were the proportions of participants who identified each option as a risk factor. Logistic regression analysis was performed to compare levels of the knowledge of factors that are associated with myopia across populations with different demographic characteristics.
Myopia is an enormous global health problem. In myopia was estimated to affect 108 million people globally. According to the Global Burden of Disease Study, approximately million people suffered from myopia worldwide Moreover, this number is estimated to increase to 4949 million and the majority of these individuals will likely come from low-and middle-income countries. Unfortunately, to date, no treatments are available to cure myopia or alter its progressive course unless a proper correction is given at the right time . Preventing myopia has become crucial. Evidence shows that immutable factors such as genetics, lifestyle, and environmental variables play important roles in the progression of myopia. Thus, identifying and avoiding exposure to these modifiable risk factors may facilitate the prevention of myopia and help reduce disease burden that is associated with myopia .
Numerous studies have explored the factors that influence the development of myopia. Accumulating evidence suggests that reducing the rate of myopia progression by 50% could reduce the prevalence of high myopia by up to 90%. People who are myopic are at greater risk of developing glaucoma and cataract, however they may be protective against age related macular degeneration and diabetic retinopathy environmental influences, genetics and parental history have a higher risk of developing myopia. However, although various risk and corrective measures for myopia have been identified, they have not been adequately popularized and recognized among the general public . For example, a systematic review assessed knowledge and attitudes about myopia prevention and treatment and found that public knowledge about the modifiable nature of myopia prevention remained inadequate, although this situation might improve over time.
A recent survey from Taiwan showed that the majority of community-dwelling people were unaware of the relationship between time spent outdoors and behavioral influences with myopia. Most investigations of knowledge and attitudes about myopia prevention have been conducted in high-income countries . Levels of knowledge of the potential for myopia prevention among individuals who live in other countries, such as Kenya, are largely unknown. Life expectancies have risen sharply over recent decades, and myopia is a serious health problem in Kenya. The age-standardized prevalence of myopia in Kenya increased by 8.6%, while the worldwide prevalence increased by only 2.7%. The estimated number of cases of myopia and total annual costs that are associated with myopia in Kenya is predicted to reach 24.25 million people and USD $114.2 million in 2050. The worldwide costs that are associated with myopia accounted for 1.09% of the global gross domestic product, whereas such costs accounts for 1.47% in Kenya, indicating that the burden of myopia is even higher in Kenya compared with the world average. Thus, effective measures are needed to facilitate myopia prevention and reduce disease burden that is caused by myopia in Kenya .
However, insufficient awareness and knowledge of the potential of myopia prevention among the Kenyans public has been a substantial obstacle. Some studies evaluated the Kenyan population’s overall understanding of Myopia, suggesting that the recognition of myopia needs to be improved. The awareness of specific protective and risk factors that are associated with myopia among the Kenyan population is deficient. To identify specific target populations and develop strategies for myopia prevention, a better understanding of these factors is needed in populations with different socio demographic backgrounds .
An online questionnaire that evaluated general knowledge of myopia was disseminated via Whatsapp a social media outlet that is widely used in Kenya. We invited Kisumu residents to complete the questionnaire. The study was approved by the Institutional Review Board of Maseno University. The surveys that were used in this study could be answered anonymously, and participation was voluntary. Consent was sent to participants and those who signed and agreed sent them back to the lead researcher. The study adhered to the tenets of the Declaration of Helsinki. Participant’s recruitment was done with the help of research assistants who had a background of optometry .
We collected a total of 3,000 questionnaires. Incomplete questionnaires were excluded. A total of 3,000 questionnaires were available for analysis. We included all participants provided they were able to read and write. Those unable to read and write were excluded and mentally challenged.
The questionnaire was written in Kiswahili and English and included two parts basic socio demographic information, including gender, age, education level, type of job, income, type of residence, and whether the respondent had contact with anyone who lived with myopia, and the following multiple- choice questions: “Which factors do you think can increase the risk of myopia?” “Which factors do you do think can reduce the risk of myopia?” The questionnaire took approximately 5 minutes to complete. Frequency distributions of all socio demographic characteristics and the proportion of participants who identified each item as a risk or protective factor were calculated. We conducted multiple logistic regression analysis to compare the knowledge of factors for each item, stratified by demographic variables. We calculated odds ratios (ORs) and 95% confidence intervals (CIs). SPSS 17 software was used to analyse the data. Values of p<0.05 were considered statistically significant .
Characteristics of the subjects
In the present study, data from 3,000 eligible samples were analysed. The average age was 39.23 ± 12.50 years. The proportions of different education levels, including primary school or illiteracy, middle school, college or university, and postgraduate education, were 1.71%, 18.51%, 50.00%, and 29.78%, respectively. A majority of the subjects were white- collar workers (77.29%) with income of 2000-10000 Kenya shillings per month (66.12%) and lived in the city (86.70%). Nearly one-third of the participants reported that they previously had contact with someone with myopia .
Awareness and understanding of myopia risk factors
Most of the participants were able to correctly recognize at least one risk factor, but 5.51% of them were unable to correctly recognize any risk factor. The percentages of the participants who accurately identified the following risk factors for dementia were 84.24% for genetics, 65.07% for reading and close up work, 56.68% for environmental conditions, 48.74% for visual stress, and 42.66% for diabetes .
We next assessed the relationship between socio demographic characteristics and knowledge of myopia risk factors using multiple logistic regression analysis. Compared with men, more women believed genetics (OR=1.68, 95% CI=1.37-2.05) was a risk factor for myopia. The age-specific analysis found that middle-aged individuals (40-65 years old) were significantly less likely to identify the contribution of genetics (OR=0.69, 95% CI=0.56-0.86), reading and close up work (OR=0.83, 95% CI=0.71-0.99), and environmental conditions (OR=0.67, 95% CI=0.57-0.79) to the progression of myopia compared with younger individuals (<40 years old), indicating that the older age group might have lower levels of knowledge of myopia risk factors. Additionally, the group with a higher level of education (college, university, and postgraduate education) had a better understanding of all five myopia risk factors.
In addition to gender, age, and education level, the type of job and contact with people with myopia also influenced the awareness of myopia risk factors. Blue-collar workers had a poorer understanding of the relationship between diabetes and dementia (OR=0.75, 95% CI=0.59-0.96) compared with white- collar workers, and retired people had an insufficient understanding of all myopia risk factors. Respondents who were never in contact with individuals with myopia were less likely to realize the roles that genetic (OR=0.73, 95% CI=0.59- 0.91), diabetes (OR=0.72, 95% CI=0.61-0.86), environmental factors (OR=0.77, 95% CI=0.66-0.91), and reading and close up work (OR=0.63, 95% CI=0.54-0.74) play in the and progression of myopia. The awareness of risk factors for myopia was not influenced by income ortype of residence.
Awareness and understanding of myopia protective factors
The proportion of participants who chose none of the five items as protective factors were 4.79%. Most of the respondents correctly recognized 90.00% for corrective lenses, 84.69% for corneal refractive surgery and 80.92% for refractive surgery as protective factors for myopia. However, only 6.14% of the individuals were aware that wearing full correction was beneficial for delaying the onset of myopia progression. Gender, age, education level, type of job, and contact with individuals with myopia had distinct influences on the awareness of protective factors for myopia. Income and type of residence did not influence the awareness of protective factors for myopia.
Compared with men, women knew more about the roles of optical correction (OR=1.33, 95% CI=1.04-1.72), refractive error surgery (OR=1.92, 95% CI=1.57-2.35), and corneal refractive surgery (OR=1.96, 95% CI=1.65-2.33) in preventing myopia. Compared with younger individuals (<40 years old), middle-aged subjects and elderly individuals were less aware that refractive surgery (40-65 years old: OR=0.60, 95% CI=0.45-0.79; ≥ 65 years old: OR=0.41, 95% CI=0.23-0.72), corneal surgery (40-65years old: OR=0.47, 95% CI=0.38-0.58; 65 years old: OR=0.43, 95% CI=0.26-0.72), and optical correction (40-65 years old: OR=0.79, 95% CI=0.65-0.95; ≥ 65 years old, OR=0.51, 95% CI=0.31-0.83) were protective factors. People with a higher level of education had a better understanding of lifestyle variables that were protective factors for myopia, with the exception of ocular drugs. Compared with white-collar workers, blue-collar workers had lower knowledge that optical correction (OR=0.64, 95% CI=0.45- 0.92) and refractive surgery (OR=0.70, 95% CI=0.53-0.91) were protective factors. Individuals who had contact with those having myopia had a better understanding that optical correction and corneal surgery were protective factors for myopia .
The present study investigated public knowledge and awareness of the factors that are associated with myopia in Kisumu using a relatively large sample. We found that the residents had an extensive but not a comprehensive understanding of myopia. Most people could correctly recognize evidence-based risk and protective factors. However, a majority of the respondents were unaware of the role of environmental factors in the development of myopia. Additionally, the understanding of factors that are related to myopia was significantly associated with socio demographic variables, such as gender, age, education level, type of job, and contact with individuals with myopia. These findings underscore the necessity to expend more effort to promote the public knowledge of myopia in Kisumu and develop different strategies for people with different backgrounds.
Previous studies suggested that knowledge of the possibility that myopia can be prevented remains poor in general. A few studies that were conducted in Kenya mainly focused on the recognition of eye strain symptom of myopia. The present results suggest that the overall understanding of factors that are associated with myopia among Kisumu population is more comprehensive than we initially believed based on similar studies in other countries. This finding may have two explanations. First, the respondents in the present study had a relatively high level of education and may be able to absorb more accurate information about myopia. Secondly, we used an online questionnaire and invited people to participate through the Internet, suggesting that our respondents may have better access to information about eye health compared with the general public. Future studies should compare the public’s awareness of myopia between Kenya and other countries and evaluate the role of the Internet in disseminating eye health information.
The factors that are associated with myopia and were used as response options in the present study can be divided into two categories: environmental and genetic factors.
Most of the respondents correctly recognized the relationship between corrective measures and myopia, but they often misunderstood the contribution of environmental factors and genetics to the development of myopia. This may be explained by the fact that the publicity of disease prevention mainly focuses on optical correction thus neglecting the fact that chronic diseases, including diabetes, are risk factors for myopia. Moreover, spectacle wearing refusal is common in the general population and people often believe that spectacle correction destroys the eyes more. Other studies also found that people had less knowledge about the role of environmental factors in the development of myopia. Thus, risk factors that are associated with the prevention of myopia need to be popularized in the general public.
Several socio demographic characteristics were independently associated with the knowledge of myopia risk and prevention factors. Several characteristics, including women, age<40 years, a high level of education, white-collar job, and having contact with individuals with myopia, were associated with a more extensive understanding of myopia, which is partially consistent with previous surveys that were conducted in Nakure. Women often have a better understanding of myopia in both Kenya and other countries. Individuals with a high level of education or previous contact with myopia patients had significantly better knowledge of risk and protective factors for myopia which may be attributable to a higher probability of accessing information about myopia. In the present study and another survey that was conducted in Asia younger people had more knowledge about myopia than middle-aged and elderly individuals. These findings suggest the need to develop different approaches for different populations to disseminate knowledge about myopia. Because the present study had a limited number of subjects who had an income<2000 shillings/month and who were from rural areas, no significant influence of income or type of residence was found. Future studies should include more subjects who have a lower income and who are from rural areas.
The strengths of the present study include investigating the knowledge of risk and protective factors for myopia in a relatively large sample of the Kisumu population and exploring demographic characteristics that are associated with the level of knowledge of myopia. Informing the public about modifiable risk and protective factors may help reduce the incidence of myopia .
The present study also has several limitations. First, selection bias might have been unavoidable because of the use of an Internet-based social media application. Second, we used simple idioms instead of professional terms so that the response options could be more easily understood by the general public, which may have caused some ambiguity. Third, the response options that were used were not comprehensive, and other factors that are associated with myopia were not assessed.
In summary, the present Internet-based survey demonstrated substantial deficits in the public knowledge of modifiable factors for myopia in Kisumu. People with different characteristics may have distinct awareness of myopia risk. These findings indicate the importance of disseminating information about myopia in Kisumu and educating the public about the role of modifiable risk and preventive factors. More information about myopia risk reduction should be delivered to the public, and different promotion strategies are needed to achieve prevention.
We wish to thank all residents who participated in this study and the research assistants.
SM is a PhD candidate. He initiated the research concept, developed the proposal, did the data collection, analyzed the data and wrote the manuscript. SO improved the research concept assisted with proposal development and reviewed the proposal, thesis and the manuscript. All authors contributed equally to the research work.
Availability of Data andMaterials
The dataset for Kisumu County residents generated and analyzed during the current study are available from the corresponding author upon reasonable request.
Consent for Publication
The study obtained ethical clearance from Maseno University Ethics and Review Committee. Eligible participants signed written consent. Names were not used to safeguard the privacy of the participants but only relevant demographic information as well as random number code was used. A separate document that links the study code to participants identifying information was only accessible to the researcher. Fact sheets on myopia were provided to the participants.
This research was fully funded by the corresponding author.
SM declares that they have no competing interest related to this study.
- Aldebasi YH. Prevalence of correctable visual impairment in primary school children in Qassim Province, Saudi Arabia. J Optom. 2014;7: 168–76.
- Dandona L, Dandona R. What is the global burden of visual impairment ?. BMC Med. 2006;4:10.
- Das D, Gupta S. A study on refractive errors in school children with complaints of headache in a rural tertiary care hospital. 2017;3:192–97.
- Dawson CR, Schwab IR. Epidemiology of cataract-a major cause of preventable blindness. Bull World Health Organ. 2012;5:493–501.
- Sewunet SA, Aredo KK, Gedefew M, et al. Uncorrected refractive error and associated factors among primary school children in Debre, District, Northwest Ethiopia. BMC Ophthalmol. 2014;29:1–6.
- Ferraz FH, Corrente JE, Opromolla P, et al. Influence of uncorrected refractive error and unmet refractive error on visual impairment in a Brazilian population. BMC Ophthalmol. 2014;14:1–10.
- Grzybowski A, Kanclerz P, Muzyka-wo M, et al. Methods for evaluating quality of life and vision in patients undergoing lens refractive surgery. Graefes Arch Clin Exp Ophthalmol. 2019;257:1091-99.
- Hashemi H, Fotouhi A, Yekta A, et al. ScienceDirect Global and regional estimates of prevalence of refractive errors :Systematicreviewandmeta-analysis.JCurr Ophthalmol. 2018;30:3–22.
- Holden BA, Fricke TR, Ho SM, et al. Global Vision Impairment Due to Uncorrected Presbyopia. Arch Ophthalmol. 2008;126:1731–39.
- Hsieh M, Lin J. Association of refractive error with vision- related quality of life in junior high school students. Taiwan Journal of Ophthalmology. 2016;6: 32–35.
- Kandel H, Khadka J, Goggin M, et al. Patient-reported Outcomes for Assessment of Quality of Life in Refractive - A Systematic Review. Optom Vis Sci. 2017;94:1102–119.
- Nowak MS. Characteristics of Refractive Errors in a Population of Adults in the Central Region of Poland. Int J Environ Res Public Health. 2018;15:10–14.