Keratometry, axial length and intra-ocular lens power variations observed during biometry
Isra Medical Journal. 2015; 7 (3): 164-167
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| ID: emr-183058
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EMRO
Objective: 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 and 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 <22mm and Haigis 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
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 and 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 <22mm and Haigis 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
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IMEMR
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Revista:
Isra Med. J.
Año:
2015