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Related Concept Videos

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
644

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Related Experiment Video

Updated: Jun 29, 2025

Subjective Refraction Test Using a Smartphone for Vision Screening
05:36

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Published on: October 18, 2024

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Measuring Vision at Home in 2023.

Anindya Samanta1, Kaitlyn Santineau2, Alexander Park2

  • 1Department of Ophthalmology, Baylor College of Medicine, Houston, Texas, USA.

Telemedicine Journal and E-Health : the Official Journal of the American Telemedicine Association
|April 2, 2024
PubMed
Summary
This summary is machine-generated.

Home visual acuity (HVA) testing offers a valuable telemedicine tool for ophthalmologists. Printable charts provide accessible and reliable HVA measurements, comparable to clinic visual acuity (CVA), aiding in monitoring vision changes.

Keywords:
ETDRS charthome visionhome visual acuityphone applicationstelemedicine

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Area of Science:

  • Ophthalmology
  • Telemedicine
  • Health Informatics

Background:

  • Home visual acuity (HVA) measurement is a highly desired telemedicine capability for ophthalmologists.
  • Remote monitoring of vision is crucial for managing eye conditions between clinic visits.

Purpose of the Study:

  • To systematically review studies comparing home visual acuity (HVA) measurements with clinic visual acuity (CVA).
  • To evaluate the accuracy and accessibility of different HVA testing methods.

Main Methods:

  • A systematic literature review was conducted using PubMed for studies published between 2010 and 2022.
  • Ten studies comparing patient HVA to clinic visual acuity (CVA) were analyzed.
  • Methods included phone apps, physical charts, computers, and websites.

Main Results:

  • Personal computers demonstrated the highest accuracy for HVA, with a bias of 1 letter.
  • Printable charts were most accessible and reliable, showing a 1-3.5 letter difference from CVA.
  • Phone apps and websites had a larger mean difference (approx. 6 letters) but moderate correlation.

Conclusions:

  • All reviewed HVA methodologies showed good negative predictive value, indicating their potential as screening tools.
  • HVA testing can effectively flag significant vision decline between ophthalmology appointments.
  • Printable charts offer a practical and reliable option for remote vision monitoring.