OBJECTIVES: To document the variations in keratometry, axial length of eye and intra-ocular lens (IOL) power observed during biometry of cataract patients and to find any significant gender difference.
STUDY DESIGN: A retrospective review of the biometry records.
PLACE AND DURATION: Saeed Eye and Medical Complex, Rawalpindi from 1st Nov 2010 to 31st Dec 2014.
METHODOLOGY: Patients of senile cataract were included from the biometry records. Keratometry readings of vertical and horizontal corneal meridian (K1 & K2) were measured with automated keratometre and axial length was measured with contact A-scan. Power of IOL was calculated by using SRK-T formula in patients with axial lengths between 22 and 26, Hoffer Q for axial lengths 26 mm with A-constant of 118. The data was analyzed with SPSS version 16.
RESULTS: 908 patient records were analyzed. The mean ±SD keratometry readings (K1 and K2) were 43.46 ±1.68 D and 44.41±1.98 D respectively. The mean ±SD axial length was 23.45±1.20mm. SRK-T was used in 818 (90.1%) cases, Hoffer Q in 68 (7.5%) and Haigis in 22 (2.4%) of cases. The mean ±SD intra-ocular lens power was 20.22±3.06D. Gender based comparison showed that the mean ±SD K1 in males (42.95 ±1.54D) was less than 43.88 ±1.67D for females (p=0.0001). The mean ±SD K2 for males (43.9 ±1.66D) was also less in females (44.78 ±1.70D) (p=0.0001). The mean ±SD axial length of eyes in males was 23.81 ±1.23mm significantly more than 23.16 ±1.08mm in females (p=0.0001). The mean ±SD IOL power was 19.68 ±3.19D in males and 20.67 ±2.86D in females (p=0.0001).
CONCLUSION: The mean keratometry readings (K1 and K2) were 43.46 ±1.68 D and 44.41±1.98 D respectively. The mean axial length was 23.45±1.20mm and mean intra-ocular lens power was 20.22±3.06D. Gender based analysis showed that females have more keratometric readings but shorter axial lengths than males and required more power of IOL to be implanted after cataract surgery.
Keratometry Readings, Axial Length, Biometry, Intraocular Lens.