First Author: J.Liang TAIWAN
Co Author(s): J. Cheng C. Liu
Purpose:
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..
Setting:
Department of Ophthalmology Tri-service General hospital
National Defense Medical Center
Taipei, Taiwan
Methods:
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.
Results:
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.
Conclusions:
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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