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FLEX Visual Acuity

By Konan Medical USA

This app is only available on the App Store for iOS devices.


Professional-grade FLEX visual acuity assessment! Visual acuity vision test charts are dynamically rendered to user-selected specifications.

-> Instant, flexible test distances from 0.33 to 6 meters (14 inches to 20 feet), with measurement convention switch selectable
-> Enhanced logic for resolution dependence of smallest optotypes at closest test distances
-> Instant, flexible Notation systems: 20/xx, LogMar, Decimal, and Metric
-> Gesture driven:
- larger - smaller optotypes
- randomization (double tap)
- selection of highlighted letter / line
- reveal of optotype selection tray
- reveal of chart overlays (masking): single lines (vertical + horizontal), single letter (with red or black crowding bars or none), and reverse contrast
-> One touch, pop-up magnifier
- very useful for smallest letter verification for presbyopic test administrators
-> Comprehensive Sloan specification optotype library:
- Sloan letters
- Sloan numbers
- Snellen letters
- Tumbling E's
- Landolt C's
- Konan Kids pediatric
- Japanese
- Korean
- Arabic
- Greek
- Hebrew
- Russian
-> Simple demo for HOTV and pediatric optotypes for comprehension assurance

What's new in Version 1.1
Now available as an individual app or as an in-app purchase with Chart2020 DUO
New icon and minor updates for iOS 8.

FLEX Visual Acuity is a beautiful complement to Konan's Chart2020 app.

Simple to use but powerful clinical tools from Konan Medical. "See what you've been Missing."


Have an idea for a novel test? We are evaluating dozens of new ideas submitted by our customers. Contact for more information.

iPad Screenshots

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FLEX Visual Acuity
View in iTunes
  • Free
  • Category: Medical
  • Released:
  • Version: 1.1
  • Size: 3.3 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPad.

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