Effect of Lens Presentation on the Clinical Oculomotor Assessment at Near

State University of New York College of Optometry

Status: Withdrawn

Conditions: Vision Disorders

Treatments: Device: Phoropter

Study type: Interventional

Funder types: Other

Identifiers

NCT02679313

Phoropter Study

Details and patient eligibility

About

This study will compare near clinical oculomotor parameters (heterophoria, vergence ranges, AC/A and accommodative findings) measured when lenses and/or prisms are introduced using three different instruments namely: (i) a standard manual phoropter, (ii) an electronic phoropter and (iii) a wearable adaptive refractor (VisionFit).

Full description

Previous studies have demonstrated differences in a number of near oculomotor parameters [e.g., heterophoria, accommodative convergence to accommodation (AC/A) ratio] when measured in a manual phoropter versus a trial frame. These differences may be due to variations in proximal vergence, differences in head and eye position and restriction of the peripheral visual field. Further, a number of standard clinical oculomotor procedures require the use of Risley rotary prisms. While prism is typically introduced in a smooth, ramp-like fashion with manual phoropters, step changes in prism are created with electronic phoropters. The precise effect of these variations on clinical measurements is unclear. Accordingly, after a routine refractive examination, a standard clinical near assessment (comprising near heterophoria, AC/A ratio, horizontal vergence ranges, amplitude of accommodation and negative and positive relative accommodation) will be carried out on the same individuals through: (i) a standard manual phoropter (American Optical model 11625), (ii) an electronic phoropter (Topcon CV-5000) and (iii) a wearable adaptive refractor (VisionFit). The latter resembles a trial frame mounted on a helmet carrier (similar to a binocular indirect ophthalmoscope headset) but includes adaptive lenses that can be changed electronically.

Sex: All

Ages: 18 to 30 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Corrected visual acuity of at least 20/20 (logMAR = 0.0) or better in each eye

Exclusion criteria

• Strabismus, amblyopia, manifest ocular disease.

Trial design

0 participants in 1 patient group

Phoropter

Experimental group

Description:

Each subject will be tested on 3 separate occasions using either the manual phoropter (American Optical 11625), electronic phoropter (Topcon CV-5000) or the wearable adaptive refractor (VisionFit).

Treatment:

Device: Phoropter