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Year : 2014  |  Volume : 6  |  Issue : 1  |  Page : 6-9

Biometry for IOL power calculation, which technology is better optical or acoustic?

Department of Cataract, Drashti Netralaya, Chakalia Road, Dahod, Gujarat, India

Correspondence Address:
Mehul Shah
Drashti Netralaya, Nr. GIDC, Chakalia Road. Dahod - 389 151, Gujarat
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DOI: 10.4103/1858-540X.138843

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Objective: The aim of this study is to investigate the accuracy of prediction of different biometric methods for the calculation of intraocular lenses. Materials and Methods: We examined consecutive cataractous eyes with the IOL-Master-500 as well as with the acoustic biometry and keratometry. In all eyes, the intraocular lens to be implanted was chosen by means of the SRK/T formula, based on the measurements conducted with our standard method. The achieved postoperative refraction is obtained, at least 4 weeks after surgery, by the treating ophthalmologists. The results were compared and analyzed statistically using SPSS17. Results: We examined 156 out of which 72 female and 84 were male. Comparison of eye lengths as well as of the keratometric measurements showed good correspondence between the obtained measurements by both methods, acoustic biometry yielding significantly (P < 0.001) different axial lengths than the IOL Master, and the B and L yielding significantly (P < 0.001) different mean corneal refraction power than the IOL Master. The accuracy of the refraction obtained postoperatively compared to the preoperative aim was better with IOL Master compared to acoustic method. Conclusions: The predicted systemic differences in measurement results could be verified. Significant improvement in accuracy of our postoperative refraction prediction was achieved using IOL master. The other advantages of the IOL Master are the substantial gain in time, as well as the fact that performance of the measurements may be delegated. Only shortcoming was the use of IOL master in mature cataract.

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