NCT02679313

Effect of Lens Presentation on the Clinical Oculomotor Assessment at Near

• Status: Withdrawn
• Phase: N/A
• Study type: Interventional
• Enrollment: 0 (actual)
• Sponsor: State University of New York College of Optometry · Academic / Other
• Sex: All
• Age: 18 Years – 30 Years
• Healthy volunteers: Accepted

Summary

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).

Detailed 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.

Conditions

• Vision Disorders

Interventions

Type	Name	Description
DEVICE	Phoropter	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). Oculomotor measurements, i.e., heterophoria, vergence ranges, AC/A and accommodative findings will be measured at each session using the different devices. Each session will be separated by a minimum of 24 hours and a maximum of 14 days.

Timeline

• Start date: 2016-02-01
• Primary completion: 2016-09-01
• Completion: 2016-09-01
• First posted: 2016-02-10
• Last updated: 2025-05-31

Locations

1 site across 1 country: United States