# VisionC (ETDRS Visual Acuity) — High and Low Contrast Chart

> High and Low Contrast Chart (iPhone/iPad app by Qvision, Departamento de Oftalmología.)

- Source: https://appshunter.io/ios/app/visionc-etdrs-visual-acuity/id1041393885 (this page in markdown: same URL + `.md`)
- Developer: [Qvision, Departamento de Oftalmología](https://appshunter.io/developer/1602553646)
- Category: Medical, Health & Fitness
- Price: $79.99
- Age rating: 4+
- Requires: iOS 10.0 · 9 MB
- Languages: American English
- Released: 2015-10-13
- Data updated: 2025-12-28
- User reviews in markdown: https://appshunter.io/ios/app/visionc-etdrs-visual-acuity/id1041393885/reviews.md

## What is VisionC (ETDRS Visual Acuity)?

VisionC is the first ETDRS chart completely configurable to be presented at any distance from 20 cm to 400 cm (1 cm step) and for any Contrast from 0 to 100% (1% step). It is the only one that allows you to control de luminance of the background and the optotype with a low-cost external luminance meter. You can use PicoDisplay App and Pico (Palette) device for this purpose.

The visual acuity with the ETDRS is usually measured at three distances (far, intermediate and near) but research studies sometimes differ in the specific distance for each one of the categories. With VisionC you can select the specific distance for each one of these three configurations in such a way you can rapidly access to the specific distance you desire. 

The App comes with a different set of letters in order to avoid memorization. Therefore either letters for distance, intermediate and near or right, left and both eyes differ to prevent memorization.

You can join our community in order to ask any question or to receive support:

www.facebook.com/groups/qvisionacademy/


## Version history (last 5 releases)

### 2.1.3 — 2025-07-09

Added support for new iPads launched before July 2025

### 2.1.2 — 2024-12-16

Added compatibility for iPad devices launched up to the end of 2024

### 2.1.1 — 2023-02-26

Added compatibility for iPads launched up to end 2022

### 2.1 — 2022-04-16

Included Snellen chart for patients non familiarized with Sloan letters. Please, use the Standard Sloan letters and do not mix subjects measured with different optotypes in your analyses.

### 2.0.5 — 2022-01-12

Changes in terms and conditions

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## More apps by Qvision, Departamento de Oftalmología

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- [StereoTAB Stereopsis Testing](https://appshunter.io/ios/app/stereotab-stereopsis-testing/id583288600)
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- [Multifocal Lens Analyzer](https://appshunter.io/ios/app/multifocal-lens-analyzer/id1076177667)

All apps by Qvision, Departamento de Oftalmología: https://appshunter.io/developer/1602553646

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2025-12-28.*