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Clinical results in phacoemulsification using the SRK/T formula.

Juliana Marques de Souza Lagrasta¹, Norma Allemann, Luciana Scapucin

¹Department of Ophthalmology, Universidade Federal de São Paulo, SP, Brazil. julagrasta@uol.com.br

Arquivos Brasileiros De Oftalmologia

|May 26, 2009

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The SRK/T formula accurately predicts refractive outcomes after cataract surgery in eyes with medium axial length. This study found good agreement between predicted and achieved refraction, supporting its use in intraocular lens calculations.

Area of Science:

Ophthalmology
Refractive Surgery
Biomedical Engineering

Background:

Accurate intraocular lens (IOL) power calculation is crucial for achieving desired refractive outcomes after cataract surgery.
The SRK/T formula is a widely used method for IOL power calculation, but its accuracy in specific ocular parameters requires ongoing evaluation.

Purpose of the Study:

To assess the predictive accuracy of the SRK/T formula for postoperative refraction in eyes with medium axial length undergoing phacoemulsification.
To evaluate the performance of the SRK/T formula in a prospective cohort of cataract patients.

Main Methods:

Prospective study involving 33 eyes with nuclear cataract undergoing phacoemulsification by a single surgeon.
Intraocular lenses were placed in the capsular bag.

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Refractive error was measured one month post-surgery and compared to SRK/T formula predictions.

Main Results:

Ocular axial lengths ranged from 22.2 mm to 24.5 mm.
The mean predicted refraction was -0.431 +/- 0.181 D, and the mean achieved spherical equivalent was -0.220 +/- 0.732 D.
55% of eyes had refractive error within +/- 0.50 D, and 91% within +/- 1.00 D of predicted refraction. A statistically significant hyperopic shift was observed (p=0.009).

Conclusions:

The SRK/T formula demonstrated satisfactory accuracy for predicting refractive error in eyes with medium axial length.
These findings support the continued use of the SRK/T formula for IOL calculations in this patient group.