This study seeks to quantify digital visual performance and subjective visual acceptance of toric contact lenses as compared to spherical lenses in low to moderate astigmatic patients.
This study seeks to quantify the near visual performance and subjective visual acceptance of toric contact lenses as compared to spherical lenses in an astigmatic cohort of patients. Primary Hypotheses: Subjects will have better near visual acuity and near visual performance with toric, as opposed to spherical, contact lens correction. As such, the following hypotheses will be tested: H01: There is no statistically significant difference in near visual acuity or near vision performance between contact lenses corrections Ha1: There is a statistically significant difference in visual acuity or vision performance between contact lenses corrections
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
30
Daily disposable soft toric contact lens
Daily disposable soft spherical contact lens
University of Houston College of Optometry
Houston, Texas, United States
Near Visual LogMAR Acuity
High contrast LogMAR visual acuity was assessed at 40 cm using the M\&S Clinical Trial Suite system (Niles, Illinois, USA). The system was calibrated according to the manufacturer's directions every day, prior to use. Testing was performed binocularly 10+/-2 days after each intervention. The test started at 20/60 and continued until three letters were missed on a line.
Time frame: 10 +/- 2 days
Dynamic Visual Acuity
Dynamic VA was determined using a custom-made iPad application. The subject was instructed to hold the iPad at 40cm and presented with a Landolt C surrounded by crowding bars for 0.3s each, starting from 0.5 LogMAR and progressing to smaller sizes using a staircase threshold method. Testing was performed binocularly 10+/-2 days after each intervention
Time frame: 10 +/- 2 days
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