Comparison of reverse-geometry lens designs for overnight orthokeratology.
OBJECTIVE
The efficacy of overnight wear of four types of reverse-geometry lenses was compared. The length of time needed to achieve correction and any adverse events that occurred during the course of the study were recorded.


METHODS
In this prospective, randomized study, 60 subjects (18 to 35 years old) with refractive error between -1.00 to -4.00 D (cyl </= -1.50) wore reverse-geometry lenses overnight only. All subjects were assigned a Rinehart Reeves lens in one eye, and subsets of 20 subjects were randomly assigned a Mountford BE, DreimLens, or Contex D Series 4 lens for the contralateral eye. Visits included baseline, dispensing, 1 day, 1 week, and 1 month. Biomicroscopy, unaided visual acuity, subjective refraction, best-corrected visual acuity at high and low contrast and high and low illumination, corneal topography, and subjective rating data were collected.


RESULTS
Forty-six subjects completed the study. At 1 month, there were no significant differences between lens types in their effect on unaided visual acuity, subjective sphere, subjective cylinder, best-corrected visual acuity at high and low contrast at high illumination and low contrast at low illumination, apical corneal radius, corneal eccentricity, and subjective ratings. Between 1 week and 1 month, there was a significant improvement in subjective ratings of quality of day and night vision (p < 0.05) but no significant change in the objective measures. No significant ocular adverse events were observed during the trial.


CONCLUSIONS
The lens types tested were all similarly effective in the reduction of myopic refractive error. Subjective ratings continued to improve after objective measures stabilized at 1 week. Overnight lens wear proceeded for 1 month without significant adverse reactions.
Tahhan
N
N
Cooperative Research Centre for Eye Research and Technology, The University of New South Wales, Sydney, NSW 2052, Australia. n.tahhan@visioncrc.org
Du Toit
R
R
Papas
E
E
Chung
H
H
La Hood
D
D
Holden
And B
AB
D000328:Adult; D003262:Contact Lenses, Extended-Wear; D019781:Corneal Topography; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000628:therapy*; D011446:Prospective Studies; D011474:Prosthesis Design; D017755:Prosthesis Fitting; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology