Comparison of Objective and Subjective Changes Induced by Multiple Pinhole Glasses and Single Pinhole Glasses

Chung-Ang University Hosptial, Chung-Ang University College of Medicine

Status: Unknown

Conditions: Functional Vision Changes

Treatments: Device: Trayner Pinhole Glasses (Trayner Glasses, Ivybridge Devon, U.K.)

Study type: Interventional

Funder types: Other

Identifiers

NCT02572544

ChungAngUHeye

Details and patient eligibility

About

Purpose of this study is to compare the ocular functional changes including pupil size, visual acuity, depth of focus, accommodative amplitude, visual field, contrast sensitivity, and stereopsis induced by multiple and single pinhole glasses, in addition, to check reading speed and survey for ocular discomfort after using both pinhole glasses.

Enrollment: 30 estimated patients

Sex: All

Ages: 20 to 45 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

1. age between 20 and 45 years;
2. spherical equivalents (SE) within ± 6.0 diopters (D);
3. correctable distant and near visual acuity by glasses up to 20/20;
4. normal intraocular pressure with normal optic disc appearance;
5. normal ocular alignment.

Exclusion criteria

1. disturbance of accommodation due to any reasons such as an Adie's pupil, Parkinson's disease, a history of previous ocular surgery or trauma, and a history of systemic or topical medication that might affect accommodation;
2. corneal pathologic features;
3. glaucoma;
4. cataracts of grade II or greater by the Lens Opacities Classification System III (LOCS III);
5. vitreous and retinal abnormalities that might limit the accuracy of testing.

Trial design

Primary purpose: Basic Science

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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30 participants in 1 patient group

Participants

Experimental group

Description:

All participants perform all exams under 3 conditions, that is baseline, single pinhole glasses, and multiple pinhole glasses

Treatment:

Device: Trayner Pinhole Glasses (Trayner Glasses, Ivybridge Devon, U.K.)