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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


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).


Shinagawa LASIK Center, Tokyo, Japan.


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.


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.


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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