Presbyopia Clinical Trial
The purpose of this study is to use a corneal topographer, a device that is readily
available in most optometric practices, in order to determine the position of the multifocal
(MF) contact lens (CL) optics in relation to the optics of the eye. The specific purpose of
this study is to evaluate if there is a relationship between the positioning of the optics
of the study lenses and the objective and subjective visual performance as well as
participant satisfaction. The MF CL lenses will be fitted to two groups of participants
(previously unsuccessful vs. currently successful MF CL wearers).
HYPOTHESES
- The measurement of the power distribution acquired from the Medmont E300 corneal
topographer is effective in determining MF CL lens centration and is a predictor of MF
CL success.
- There is a difference in MF CL centration, determined by corneal topography, between
successful and unsuccessful MF CL wearers.
- MF CL centration, determined by corneal topography, is correlated with visual
performance, determined by ocular aberrometry, measures of visual acuity and subjective
satisfaction.
n/a
Allocation: Randomized, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Basic Science
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