Effects of Wearing Progressive Addition Lens on Working Distance and Refractive Status in Adult Computer Users

Not Applicable

Completed

• Conditions: Video Game Play Using Handheld Computer
• Interventions: Device: Spectacle lens

• Registration Number: NCT02775396
• Lead Sponsor: The Hong Kong Polytechnic University

Brief Summary

With the increasing reliance on tablet computers and smartphones in daily life, it is important to determine whether and how the prolonged usage of these handheld digital devices influences the working habits and refractive status. This study aimed to determine the effects of wearing conventional single-vision lenses vs. new progressive addition lenses on the working distance and refractive status while playing interactive video game in Chinese pre-presbyopic adult computer users.

Detailed Description

Chinese adult computer users were recruited from two age cohorts. They were prescribed, in random order, with conventional single-vision lenses and progressive addition lenses designed for handheld digital display devices (iPad). Basic ocular parameters were measured through a comprehensive eye examination at the baseline visit. Working distance and refractive shift were measured immediately after delivering the lenses and after one month of lens wear. Working distance were recorded with an automatic ultrasound sensor while the participants were playing a 30-minute video game. Refractive-error shift before and after playing the video game were measured with an open-field autorefractor in both eyes and averaged.

Study Timeline

• Study Start: 2014-09
• Primary Completion: 2015-03
• Study Completion: 2015-04
• Status Verified: 2016-05
• Study First Submitted: 2016-05-11
• Study First Submitted QC: 2016-05-16
• Last Update Submitted: 2016-05-16
• Study First Posted: 2016-05-17
• Last Update Posted: 2016-05-17

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 64

Inclusion Criteria

• Hong Kong Chinese
• Computer users (computer usage >2hours/day)
• Spherical-equivalent refractive errors between plano and -9.00D and cylindrical power ≤2.50D

Exclusion Criteria

• Anyone with visual acuity worse than 0 logMAR, anisometropia more than 2.00D, abnormal accommodative function, wearing rigid contact lens, and a history of ocular surgery and pathology

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Adult computer user	Spectacle lens	Wearing each of the two spectacle lens designs for one month in random sequence

Primary Outcome Measures

Name	Time	Method
Change in refractive status measured by an automatic refractometer	Change in refractive status shift after one month of lens wear	Refractive status was measured before and after the participant played a 30-minute computer games using an iPad tablet computer. The refractive status shift (post-task refractive status minus pre-task refractive status) was calculated for each 30-minute game play immediately after the lens delivery and one-month after the lens wear. Absolute and relative changes in the refractive shirt were analyzed and compared between two lens designs.
Change in near working distance measured by an automatic ultrasound sensor	Change in near working distance after one month of lens wear	Near working distances were measured continuously over a 30-minute interval while the participant was playing computer games using an iPad tablet computer. The mode of the accumulative working distances was analyzed for each 30-minute interval collected immediately after the lens delivery and one-month after the lens wear. Absolute and relative changes in the working distances were analyzed and compared between two lens designs.