This letter is in response to letter by Singh et al.[1] pertaining to our recent publication “Biometric changes in Indian pediatric cataract and postoperative refractive status”.[2] Here are our responses point-by-point.
The number of patients in unilateral group was not too large and hence a reliable analysis was not possible to compare unilateral and bilateral eyes.[2]
The refraction on day 1 post operatively was not done under general anaesthesia. It was not expected to be completely accurate, but it gave a general impression of the accuracy of under correction and desired refractive status.[3]
Based on previous experience with SRK II and postoperative refractive status of Indian children, nomogram in Table 1 was used for desired outcomes.[4]
Table 1.
Undercorrection of IOL power based on SRKII formula
| Age | Undercorrection to IOL* power calculated by SRK II formula** |
|---|---|
| >5 years | no under correction |
| 5 years | 2% under correction |
| 4 years | 3% under correction |
| 3 years | 4% under correction |
| 2 years | 5% under correction |
| 18 months | 7% under correction |
| 1 year | 10% under correction |
| 6 months-1 year | 15% under correction |
| <6 months | 20% under correction |
*IOL- Intraocular lens, **Sanders DR, Retzlaff J, Kraff MC. Comparison of the SRK II™ formula and other second generation formulas. J Cataract Refract Surg. 1988 Mar; 14 (2):136-41
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Conflicts of interest
There are no conflicts of interest.
References
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