چكيده لاتين :
Background: Myopia has different prevalence rate worldwide
and there is controversial points about its environmental
risk factors. The prevalence of myopia in medical
interns at Shiraz Medical School and its probable risk factors
were studied.
Method: In this retrospective cross-sectional study, three
hundred interns (ih-year medical students) at Shiraz University
of Medical Sciences were examined by auto refractometer
and subjective refraction. We Also administered a questionnaire
to evaluate the age of the onset of myopia, the power of
the first spectacles, and its power in the first year of medical
school, parental refractive error, prematurity, mean amount of
time spent for studying, sleeping, and TV watching per day
among myopic students and a comparable control group.
Results: Ninety-two out of 300 (31%) interns had myopia
over 0.5 diopters with similar age, sex, time spent for sleeping
and studying as 88 randomly selected non-myopic controls.
Parental myopia was reported in 54% of cases and 25%
of controls (p(LESS THAN)0.05). 60% of myopic interns had more than
0.75 diopters of progression during medical school years with
similar age, sex, and time spent for sleeping and studying as
40% with less than 0.75 diopters of progression. Mean age of
onset of myopia was 17.00(PLUS-MINUS)2.88 years with mean initial
amount of -0.96(PLUS-MINUS)0.45 diopters in former subgroup, but in
the latter subgroup, these were 13.84(PLUS-MINUS)2.99 years and 1.37(PLUS-MINUS)
1.40 diopters, respectively (p(LESS THAN)0.05).
Conclusion: Those students with myopia progression during
medical study had later onset with less amounts of initial myopia
than those without progression during the same period.
