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Evaluating corneal pachymetry and central ablation depth as measured with Schwind OCP

Poster Details

First Author: S.Yukawa JAPAN

Co Author(s):    T. Nakamura   M. Tomita           

Abstract Details



Purpose:

To evaluate the performance of real-time optical coherence pachymetry (OCP) by comparing the corneal pachymetry and central ablation depth measurements to those of an ultrasound pachymeter (USP).

Setting:

Shinagawa LASIK Center, Tokyo, Japan.

Methods:

For 525 eyes of 273 patients, LASIK surgery was performed using a FEMTO LDV™ Crystal Line femtosecond laser for flap creation and a SCHWIND AMARIS® 750S for refractive correction. Flap thicknesses were targeted between 90 and 110?m. Using two devices; OCP and USP, the pre-corneal thickness, bed thickness, residual bed thickness, and post-corneal thickness were measured. The flap thickness and the central ablation depth were calculated from these measured values.

Results:

For OCP and USP, the average of the pre-corneal thicknesses were 532.6 and 545.3?m, bed thicknesses were 419.9 and 426.2?m, residual bed thicknesses were 329.9 and 336.5?m, post-corneal thicknesses 488.9 and 491.1?m, flap thicknesses were 112.7 and 119.1?m, and central ablation depths were 90.0 and 89.7?m, respectively.

Conclusions:

The measurements and calculations from OCP were clinically acceptable. Using OCP, the surgeon is able to gain a valuable benefit since he or she can now obtain an accurate pachymetry intraoperatively without interrupting the surgical procedure.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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