Related Experiment Video
Updated: Aug 15, 2025
05:10
Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
Published on: March 17, 2023
3.0K
Development and Validation of a Digital (Peek) Near Visual Acuity Test for Clinical Practice, Community-Based Survey,
Marzieh Katibeh1,2, Sandip Das Sanyam3, Elanor Watts1,4
1Peek Vision, Berkhamsted, UK.
Translational Vision Science & Technology
|December 30, 2022
Summary
A new smartphone test, Peek Near Vision (PeekNV), accurately measures near visual acuity (NVA) and screens for near vision impairment (NVI). This validated tool offers a rapid and reliable alternative for vision testing.
Area of Science:
- Ophthalmology
- Digital Health
- Public Health
Background:
- Near vision impairment (NVI) affects over 500 million individuals globally.
- Accessible and accurate testing is crucial for identifying those needing vision services.
Purpose of the Study:
- To develop and validate a smartphone-based near visual acuity (NVA) test, Peek Near Vision (PeekNV).
- To provide a readily accessible tool for NVI screening and measurement.
Main Methods:
- Developed two forms of PeekNV: quantitative NVA measurement and binary NVI screening.
- Conducted a validity study with 483 participants in Nepal, using a conventional Tumbling "E" Near Point Vision Chart as the reference.
- Employed Bland-Altman limits of agreement for NVA test agreement and Cohen's kappa, sensitivity, and specificity for screening assessment.
Main Results:
- PeekNV demonstrated comparable NVA results to the standard chart, with mean difference of 0.008 logMAR units.
- The screening test showed high overall agreement (92.9%, κ = 0.85), with positive predictive value of 93.2% and negative predictive value of 92.7%.
- PeekNV screening was significantly faster (11.6 seconds) than the chart method (14.9 seconds).
Conclusions:
- The smartphone-based PeekNV test provides rapid and comparable NVA results to established methods.
- PeekNV is a validated and reliable option for near vision testing using smartphones or digital devices.
