Aziz Jan Bashir, Adnan Aslam Saleem, Badr Al-ahmadi, Ashbala Khattak.
Horizontal Corneal Diameter Measurements Using Visante OCT, IOLMASTER, ATLAS Topography and Surgical Calipers for Optimal Sizing of Phakic Intraocular Lenses.
Al-Shifa J Ophthalmol Jan ;12(4):207-12.

Purpose: To assess the conformity among various modalities used to approximate the posterior chamber horizontal diameter for optimal sizing of phakic intraocular lenses (pIOL). Methods: Three different devices that estimate the white to white (WTW) diameters of the eye were used to obtain the measurements in 102 eyes of 51 normal patients aged 22-47; IOLMaster, Atlas Corneal Topographer (all devices by Carl Zeiss Meditec, Inc.) and a surgical caliper. Angle to angle (ATA) and sulcus to sulcus (STS) was measured using Visante OCT. Results: The mean WTW was 12.09 ± 0.43, 12.44 ± 0.51 and 12.18 ± 0.42 mm with IOLMaster, Atlas topography and calipers respective¬ly. Mean ATA and STS with Visante OCT were 11.85 ± 0.49 and 12.44 ± 0.48 mm respectively All combination differences were significant among the four devices used to estimate the horizontal diameter of the sulcus. Repeated measure ANOVA was done by Greenhouse-Geisser test. Pair wise comparison was done and all the combination differences among the devices were statistically significant (p < 0.0001). Conclusion: The various available imaging modalities used to get the approximate horizontal diameter of the posterior chamber for a best fit phakic intraocular lens cannot be used interchangeably.

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