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Visual acuity, refraction and corneal topographic change after simulated aircraft ejection in patients following orthokeratology

Poster Details

First Author: J.Liang TAIWAN

Co Author(s):    J. Cheng   C. Liu           

Abstract Details


To determine the stability of the visual acuity, refraction, corneal topography, pachymetry, anterior chamber depth and the intraocular pressure in those patients of following overnight Orthokeratology when subjected to vertical acceleration at 8 times the force of gravity (+6 Gz) in a simulated ejection system on the ground..


Department of Ophthalmology Tri-service General hospital National Defense Medical Center Taipei, Taiwan


The subjects were 10 healthy male flight surgeons between 25 and 26 (Mean 25.3) year of age. They receive the overnight Orthokeratology for two weeks. They then underwent a controlled rapid-sequence ejection up to +6Gz .Visual acuity, refraction, corneal parameter including corneal curvature, corneal thickness, anterior chamber depth and the intraocular pressure were recorded before, immediate, and 20 minutes after the +6Gz ejection. We compared our study group findings with those of a control group made up of 20 subjects who were not undergoing orthokeratology also performed the same ejection procedure.


The pre-ejection, immediate, and 20 minutes post ejection measurements were not statistically significantly different between visual acuity, refraction and the parameters in the Orbscan topography including anterior, posterior curvature, central corneal thickness, and intraocular pressure by a paired t-test. The only significant finding is the ACD (anterior chamber depth) in orthokeratology group. The pre-ejection is 2.978; the 20 minutes post ejection is 3.01, p<0.05.


The visual acuity, refraction and corneal topographic change in patients following orthokeratology are stable when subjected to a rapid vertical ejection at 6 times the force of gravity. Anterior chamber depth increase is the only significant change post ejection in the orthokeratology group. FINANCIAL DISCLOSURE?: No

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