To determine the progressive changes in axial length, keratometric reading and lens power of human eyes, biometric measurement in 2,238 normal eyes was prospectively studied.

The mean axial length was 23.36 + - 1.04 mm. in male and 22.94 + - 1.26 mm. in female. The mean keratometric measurement in vertical meridian was 43.51 + - 2.10 diopters in male and 44.32 + - 2.18 diopters in female. The mean horizontal keratometric values was 43.59 + - 1.67 diopters in male and 44.32 + - 1.63 diopters in female. The mean lens power was 19.16 + - 2.59 diopters in male and 19.65 + - 2.84 diopters in female.

Keratometric reading in diopters seems to increase and lens power decreases with age at a statistically significant level. However, no significant change was noted in axial length, although it increases approximately 0.5 mm with age.