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

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

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.

Study Overview

• Status: Completed
• Conditions: Video Game Play Using Handheld Computer
• Intervention / Treatment: Device: Spectacle lens

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 Type: Interventional
• Enrollment (Actual): 64
• Phase: Not Applicable

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 40 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

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 Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Adult computer user; Wearing each of the two spectacle lens designs for one month in random sequence

Device: Spectacle lens; Wearing a spectacle lens design with corrective prescription power while playing computer game using an iPad tablet computer. Two lens designs were prescribed for each participant: the conventional single-vision lens and a new progressive addition lens designed for handheld digital device. Primary outcome measures were performed immediately after each lens delivery and one-month of lens wear.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in near working distance measured by an automatic ultrasound sensor	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.	Change in near working distance after one month of lens wear
Change in refractive status measured by an automatic refractometer	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 refractive status shift after one month of lens wear

Collaborators and Investigators

• Sponsor: The Hong Kong Polytechnic University
• Collaborators: Carl Zeiss

Publications and helpful links

General Publications

• Kee CS, Leung TW, Kan KH, Lam CH. Effects of Progressive Addition Lens Wear on Digital Work in Pre-presbyopes. Optom Vis Sci. 2018 May;95(5):457-467. doi: 10.1097/OPX.0000000000001211.

Study record dates

Study Major Dates

• Study Start: September 1, 2014
• Primary Completion (Actual): March 1, 2015
• Study Completion (Actual): April 1, 2015

Study Registration Dates

• First Submitted: May 11, 2016
• First Submitted That Met QC Criteria: May 16, 2016
• First Posted (Estimate): May 17, 2016

Study Record Updates

• Last Update Posted (Estimate): May 17, 2016
• Last Update Submitted That Met QC Criteria: May 16, 2016
• Last Verified: May 1, 2016

More Information

Terms related to this study

• Other Study ID Numbers: P14-0085