Purpose: The purpose of the study was to measure the effect of dioptric power on choroidal thickness in myopic subjects. 

Methods: A comparative cross sectional study design was conducted in myopic subjects. Fifty-one patients were included (20 female and 31 male). Purposive sampling technique was used to collect the data. Data was gathered by using instruments Optical coherence tomography and data was analyzed by using statistical test one-way anova in SPPS version 22. 

Result: Fifty-one myopic patients were examined. Out of which17 individuals were mild myopic with dioptric power of (-1 to -2D), 17 was moderate myopic with dioptric power of (-3 to-4D) and 17 were high myopic with dioptric power of (-5to -6D). Choroidal thickness was measured by enhanced depth optical coherence tomography. There was a statistically significant correlation between choroidal thickness and dioptric power. Choroidal thickness at fovea with decreased significantly (p value 0.001) with the increase in dioptric power. 

Conclusion: While calculating the retinal choroidal thickness, dioptric power has been considered as an important variable. There is a significant decrease in the choroidal thickness as dioptric power increases.