Azlyn Azwa, Jasman
(2008)
A preliminary study to compare
the prediction error of postoperative
refraction in paediatric cataract surgery
between 2 different intraocular lens power
calculation formulas.
Masters thesis, Universiti Sains Malaysia.
Abstract
The treatment of paediatric cataracts has progressed tremendously in the
past 15 to 20 years. There is a growing trend towards intraocular lens implantation in
infants and younger children whose eyes are still undergoing rapid growth and refractive
changes.
Objective This study is intended to assess the predictability of desired refractive
outcomes at 3 month postoperative period in paediatric patients undergoing cataract
surgery with primary placement of an intraocular lens.
Methodology : This randomized interventional study of 31 eyes (24 patients) that
successfully underwent cataract surgery and intraocular lens implantations. All patients
were 12 years old and below. Intraocular lens power calculations were made using either
SRK II or Modified Formula For Paediatric IOL Calculation. The postoperative refractive
outcome was taken as the spherical equivalent of the refraction at 3 month postoperative
follow-up. The prediction error was taken as the absolute difference between the predicted
and the actual refraction. The data were analysed to compare the mean prediction error
between SRK II and Modified Formula and evaluate the predictability.
Results : The mean prediction error in the SRK II group was 1.03 (0.69) D while
in Modified Formula 1.14 (1.19) D. The SRK II group showed lower prediction error of
0.11 D compared to Modified Formula group, but this was not statistically significant
XIV
(p > 0.05). 18.75% eyes in SRK II group achieved good predictability i.e. the refraction
postoperatively was within± 0.5 D from predicted refraction compared to 46.67% eyes in
the Modified Formula group. However the difference of the predictability between the two
fonnulas was also not statistically significant.
Conclusion We would like to conclude that the predictability of postoperative
refraction in paediatric cataract surgery is comparable between Modified Formula and
SRK II fonnula. The existence of the Modified Fonnula provides an alternative to the
ophthalmologist for intraocular lens calculation in paediatric patients.
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