IJCRR - 7(10), May, 2015
A STUDY ON MYOPIA AMONG THE STUDENTS OF A DENTAL COLLEGE IN KERALA
Author: Shiny George, Biju Baby Joseph, Mrs. Kavitha Paul
Category: General Sciences
Background: Myopia is one of the leading causes of vision loss around the world .Various studies from different parts of the world show a dramatic increase in refractive error, especially myopia among school and college students. Higher levels of education like medical education have been repeatedly associated with greater myopia prevalence.
Objective: To study the prevalence and the underlying factors of myopia in BDS students of a Dental College in Kerala.
Research methodology: Eighty nine BDS students (2012 - 2012 batches) were examined. Students were selected from each class by systematic random sampling technique, their visual acuity was checked using Snellen’s Chart and Diopters were obtained. Details of factors were obtained using a questionnaire.
Results: Prevalence of myopia was observed as 40.4%. First and second year students had a greater percentage of myopia with 46.4 % and 56.7% respectively. There was a strong relationship with years after diagnosing myopia which indicates that majority of them developed it in less than 5 years (p=0.000). Siblings of most of myopics also had myopia (p=0.002). Sleeping habits showed a significant relationship with myopia (0.037). Duration of TV watching, duration of computer use, Reading hours, type of light used and playing or texting with cell phone were not significant.
Conclusion: Prevalence of myopia was high among dental students (40.4%).
Keywords: Myopia, Refractive error, Visual acuity
Shiny George, Biju Baby Joseph, Mrs. Kavitha Paul. A STUDY ON MYOPIA AMONG THE STUDENTS OF A DENTAL COLLEGE IN KERALA International Journal of Current Research and Review. 7(10), May, 61-65
1. See JL, Wong TY, Yeo KT. Trends in the patterns of blindness and major ocular diseases in Singapore and Asia. Ann Acad Med Singapore1998; 27: 540-6.
2. Sperduto RD, Seigel D, Roberts J, Rowland M. Prevalence of myopia in the United States. Arch Ophthalmol 1983; 101: 405-7.
3. Dandona R, Dandona L, Naduvilath TJ, Srinivas M, et al. Refractive errors in an urban population in Southern India: The Andhra Pradesh Eye Disease Study. Invest Ophthalmol Vis Sci 1999; 40: 2810-8.
4. Lewallen S, Lowdon R, Courtright P, et al. A populationbased survey of the prevalence of refractive error in Malawi. Ophthalmic Epidemiol 1995;2:145–9.
5. Gilbert CE. A pilot study to evaluate logistics and methods for a prevalence and cause survey of visual impairment and hearing impairment in children. London: unpublished report to the Ministry of Health, Gaborone, Botswana, 1995:1–34.
6. Yap M, Wu M, Liu ZM, et al. Role of heredity in the genesis of myopia. Ophthalmic Physiol Opt 1993;13:316–9.
7. Angle J, Wissmann DA. The epidemiology of myopia. Am J Epidemiol 1980;111:220–8
8. Saw SM, Chua WH, Hong CY, Wu HM, Chan WY, Chia KS, et al. Nearwork in early-onset myopia. Invest Ophthalmol Vis Sci 2002; 43: 332-339.
9. Simensen, B and LO Thorud, ‘Adult-onset myopia and occupation’, Acta Ophthalmologica Scandinavica, vol. 72, 1994, pp. 469–71.
10. Tan, NWH, S-M Saw, DSC Lam, H-M Cheng, U Rajan, and S-J Chew, ‘Temporal variations in myopia progression in Singaporean children within an academic year’, Optometry and Vision Science, vol. 77, 2000, pp. 465-472.
11. Ting, PWK, CSY Lam, MH Edwards and KL Schmid, ‘Prevalence of myopia in a Group of Hong Kong microscopists’, Optometry and Vision Science, vol. 81, 2004, pp. 88-93.
12. Von Noorden, GK and RA Lewis, ‘Ocular axial length in unilateral congenital cataracts and blepharoptosis’, Investigative Ophthalmology and Visual Science, vol.28, 1987, pp. 750-752.
13. Wildsoet, CF and KL Schmid, ‘Optical correction of form deprivation myopia inhibits refractive recovery in chick eyes with intact or sectioned optic nerves’, Vision Research, vol. 40, 2000, pp. 3273-3282.
14. Lin LL, Shih YF, Tsai CB, Chen CJ, Lee LA, Hung PT, et al. Epidemiologic study of ocular refraction among schoolchildren in Taiwan in 1995.Optom Vis Sci 1999;76:275-281,2
15. Kinge B and Midelfart A. Refractive changes among Norwegian university students. A threeyear longitudinal study. Acta Ophthalmol Scand 1999; 77: 302-305.
16. Au Eong KG, Tay TH, Lim MK. Race, culture and myopia in 110,236 young Singaporean males. Singapore Med J 1993; 34: 29-32.
17. Saw SM, Katz J, Schein OD, Chew SJ, Chan TK. Epidemiology of myopia. Epidemiol Rev 1996; 18:175-87.
18. Chow YC, Dhillon B, Chew PTK, Chew SJ. Refractive errors in Singapore medical students. Singapore Med J 1990; 31:472-3. 19. Midelfart A, Aamo B, Sjohaug KA, Dysthe BE. Myopia among medical students in Norway. Acta Ophthalmol 2007; 70: 317-22.
20. Fledelius HC (2000) Myopia profile in Copenhagen medical students 1996–1998. Refractive stability over a century is suggested. Acta Ophthalmol Scand 78:501–505
21. Richler A and Bear JC. Refraction, nearwork and education: a population study in Newfoundland. Acta Ophthalmol (Copenh) 1980; 58: 468-478.
22. Zhan MZ, Saw SM, Hong RZ, Fu ZF, Yang H, Shui YB, et al. Refractive errors in Singapore and Xiamen, China - a comparative study in school children aged 6 to 7 years. Optom Vis Sci. 2000; 77: 302-308
23. Seet B, Wong TY, Tan DTH, Saw SM, et al. Myopia in Singapore: taking a public health approach. Br J Ophthalmol 2001; 85: 521-6.
24. Kinge B, Midelfart A, Jacobsen G and Rystad J. The influence of near-work on development of myopia among university students. A three-year longitudinal study among engineering students in Norway. Acta Ophthalmol Scand 2000; 78: 26-29.
25. McBrien NA, Adams DW. A longitudinal investigation of adult onset and adult progression of myopia in an occupational group. Refractive and biometric findings. Invest Ophthalmol Vis Sci 2008; 38: 321-33