Determine Functions of Pinhole Glasses on the Eyes

Not Applicable

• Conditions: Vision, Ocular

• Registration Number: NCT02111356
• Lead Sponsor: Chung-Ang University Hosptial, Chung-Ang University College of Medicine

Brief Summary

Pinhole glasses which is using pinhole effect may induce a functional change on the eyes, including Distance and near visual acuity(DVA, NVA), Pupil size, DOF, Accomodative amplitude, CS, Visual field(VF), Stereopsis.

Detailed Description

Not available

Study Timeline

• Status Verified: 2014-04
• Study Start: 2014-04
• Primary Completion: 2014-04
• Study Completion: 2014-04
• Study First Submitted: 2014-04-04
• Study First Submitted QC: 2014-04-09
• Last Update Submitted: 2014-04-09
• Study First Posted: 2014-04-11
• Last Update Posted: 2014-04-11

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

• Age : between 20 and 50 years old
• Visual acuity : correctable distant and near visual acuity by glasses up to 20/20
• Others : Normal intraocular pressure, optic discs with a healthy appearance, and normal ocular alignment.

Exclusion Criteria

• History of systemic or topical medication that might affect accommodation
• Others : Corneal pathologic features, previous ocular surgery, glaucomatous optic discs, glaucoma, cataracts of grade II or greater, vitreous opacity, or retinal abnormalities that might limit the accuracy of test.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Primary Outcome Measures

Name	Time	Method
Distance and near visual acuity(DVA, NVA)	Change from baseline at 1 week	Check distance(4m) and near(40cm) visual acuity using Snellen chart, Visual Acuity chart 2000, respectively.; At 1 week, cheked with wearing the pinhole glasses (Trayner Pinhole Glasses, Trayner Glasses, U.K.)

Secondary Outcome Measures

Name	Time	Method
Depth of focus	Change from baseline at 1 week	Check with 4m Snellen chart.; At 1 week, cheked with wearing the pinhole glasses (Trayner Pinhole Glasses, Trayner Glasses, U.K.)
Accomodation	Change from baseline at 1 week	check by Donder's push-up method. The subject was instructed to view the target letter (20/20 reduced Snellen number), which initially was positioned at approximately 40 cm. The target then was moved progressively closer to the patient's eye at approximately 5 cm per second until the subject noticed the target starting to blur.; At 1 week, cheked with wearing the pinhole glasses (Trayner Pinhole Glasses, Trayner Glasses, U.K.)
Visual field	Change from baseline at 1 week	Humphrey Visual Field Analyzer (Carl Zeiss Meditec, Inc., Dublin, CA, USA) using a 30-2 Swedish Interactive Threshold Algorithm; At 1 week, cheked with wearing the pinhole glasses (Trayner Pinhole Glasses, Trayner Glasses, U.K.)
Contrast sensitivity	Change from baseline at 1 week	CSV-1000E Contrast Testing Instrument (VectorVision, Dayton, OH, USA) at 2.5m distance under the standard brightness (85 cd/m2); At 1 week, cheked with wearing the pinhole glasses (Trayner Pinhole Glasses, Trayner Glasses, U.K.)
Stereopsis	Change from baseline at 1 week	Randot Stereotest (Stereo Optical Co, Chicago, Illinois, USA); At 1 week, cheked with wearing the pinhole glasses (Trayner Pinhole Glasses, Trayner Glasses, U.K.)
Pupil size	Change from baseline at 1 week	Check the pupil size using WASCA Analyzer(Carl Zeiss Meditec, Germany)

Trial Locations

Locations (1)

Department of Ophthalmology, Chung-Ang University School of Medicine, Chung-Ang University Hospital; 🇰🇷 Seoul, Korea, Republic of