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It has been hypothesized that there exists some correlation between myopia and ABO blood group. Current study aimed to study the distribution of ABO blood group among first year medical students and also to assess the association of myopia among different blood groups. Material amd method: A cross sectional study conducted by Department of Physiology on first year medical students in a medical college in Bangalore.Blood group of the subjects was determined by slide method and microscopy and details regarding myopia and family history of myopia were collected via questionnaire from participants who confirmed usage of spectacles or contact lenses for vision correction. Results: Of the total 142 subjects, 77(54.2%)were males and 65 (46%) were females. Most common ABO blood group in this population was found to be B positive (33%) followed by O positive (30%). Out of 142 participants, 46(32.39%) were Myopics, i.e 24(16.9%) females and 22 (15.49%) males. B blood group showed higher prevalence of myopia when compared to other ABO blood groups. Odds ratio done to compare risk of Myopia between B and Non B blood groups revealed that B blood group showed higher risk (Odd’s ratio 1.70) of myopia but this was not statistically significant. Relative risk of myopia was higher in Rh positive group (1.09) in comparison to Rh negative blood group and it was not statistically significant. Conclusions: B blood group participants showed slightly higher prevalence of myopia as compared to other blood groups but it was not statistically significant.

ABO Blood Group Distribution and its Association with Myopia among First Year Medical Students in Bangalore - A Cross Sectional Study