Response to comments on: Biometric changes in Indian pediatric cataract and postoperative refractive status.

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.