Materials and Methods: We selected 54 randomn cataract patients for our study. IOLMaster( Carl-Zeiss IOLMaster 500 ) was used to measure the biometry of the catarct patients. Ultrasonic biometry was measured by a senior and junior registrar. Cataract surgery was performed using phacoemulsification and foldable intraocular lens was implanted. Postoperatively refraction was taken at the first month postopertively. The spheric error measured by the IOLMaster , was compared to the spheric error on comparison of ultrasonic measurements in the junior and senior registrar.

Results: Axial length measurements between the IOLMaster and the ultrasound measurements of the junior and senior registrar were statisticaly significant (p<0.05), however there was no statistical difference between the measurements made by the junior and senior registrar. K1 and K2 measurements showed no statisticaly significant difference between the groups. .IOLMeasurement calculation differed among the groups p>0.05 Postoperative refraction calculated by the IOLMaster was -0.48±0.74 dioptres. Whereas the predicted post operative refraction for the IOLs calculated by the senior and junior registrars was -1.06±1.33 and -1.22±1.08 respectively. IOLMaster biometry refractive errorwhen compared to ultrasound biometry was statisticaly significant (p<0.05).

Conclusions: IOLMaster when compared to ultrasound biometry iol calculation and axialaxial length gave statistically better results. The error in ultrasonic biometry was due to inexperience. Keywords : Biometry, ultrasound, IOLMaster, axial length, cataract