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

NCT02775396 | Completed

• 1 other identifier: P14-0085
• Study Type: interventional
• Target: 64
• Locations: 0 countries
• Sites: N/A

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.

Conditions

Video Game Play Using Handheld Computer

Outcome Measures

Primary Outcomes (2)

• 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

Study Arms (1)

Adult computer user

EXPERIMENTAL

Wearing each of the two spectacle lens designs for one month in random sequence

Device: Spectacle lens

Interventions

Spectacle lens DEVICE

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.

Adult computer user

Eligibility Criteria

• Age: 18 Years - 40 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

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

You may not qualify if:

• 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

Sponsors & Collaborators

• The Hong Kong Polytechnic University: lead
• Carl Zeiss: collaborator

Related Publications (1)

• 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.

  PMID: 29683984 DERIVED

Study Officials

• Chea-su Kee, PhD

  The Hong Kong Polytechnic University

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: May 11, 2016
• First Posted: May 17, 2016
• Study Start: September 1, 2014
• Primary Completion: March 1, 2015
• Study Completion: April 1, 2015
• Last Updated: May 17, 2016

Record last verified: 2016-05