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Horizontal corneal diameter and AC depth by cornea OCT, Orbscan IIZ versus GALILEI in 145 eyes: an evaluation of equivalence

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Session Details

Session Title: Corneal Biomechanics

Session Date/Time: Monday 15/09/2014 | 17:00-18:30

Paper Time: 17:54

Venue: Capital Hall A

First Author: : K.Abdelrahman SAUDI ARABIA

Co Author(s): :                  

Abstract Details


To compare the results of horizontal corneal diameter and anterior chamber depth by non-invasive methodology using the three most relied upon imaging machines in the cornea and refractive world. VISANTE is an anterior segment imaging device, GALILEI is famous for its rotating dual scheimpflug imaging and ORBSCAN IIz uses a horizontal slit scanning method.


Magrabi Riyadh Center, Riyadh, Saudi Arabia.


In this comparative study of a single-surgeon, 73 patients for cornea and refractive surgery were included. A total of 145 eyes from 21 females and 52 males, specifically 72 OD and 73 OS. All patients were subjected to the three imaging devices upon consultation and prior to surgical intervention.


Average horizontal corneal diameter measurement using Visante OCT is 12.106 + 0.74mm(SD), by Galilei is 12.523 + 0.52mm (SD) and by Orbscan IIz is 11.926 + 0.40 mm(SD). Average anterior chamber depth measurement using Visante OCT is 3.201 + 0.31mm(SD), by Galilei is 3.407 + 0.29mm (SD) and by Orbscan IIz is 3.188 + 0.35 mm(SD).


All the three imaging devices produced varying results. The advent of anterior segment imaging, however, has been the forerunner in accuracy and reliability of measuring the horizontal corneal diameter and anterior chamber depth. Statistical results showed the relatively close proximity of results between Visante OCT and Orbscan IIz both in the measurement of horizontal corneal diameter and anterior chamber depth. Rotating scheimflug imaging of Galilei non-conclusively overestimates both the white to white and anterior chamber depth of the eye.

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