Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator
Opening Apple Books.If Apple Books doesn't open, click the Books app in your Dock.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To download from the iTunes Store, get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download

Ridgevue Contrast Sensitivity Test

Student Version

This book is available for download with Apple Books on your Mac or iOS device. Multi-touch books can be read with Apple Books on your Mac or iOS device. Books with interactive features may work best on an iOS device. Apple Books on your Mac requires OS X 10.9 or later.


This iPad-based letter contrast sensitivity test is similar in principle to the well-established Pelli-Robson Chart and Mars Letter Contrast Sensitivity Test. 
The letters have all been calibrated for the Retina Display on the iPad 3 and iPad 4. The contrast values are not valid for earlier versions.
This student version of the test has not been validated. The full, validated version, available from the Store, should be used for clinical trials, research, driver testing, disease evaluation, drug monitoring, etc.
Letter contrast sensitivity testing is fast to administer and easy for patients to understand, due to its similarity to visual acuity charts. Letter-based tests have been shown to be more repeatable than tests using gratings.
Unlike other tests, the test requires no external lighting and runs on the ubiquitous iPad without need for special software or calibration. The test utilizes the high quality iPad screen to produce letters with contrasts as low as 0.6%, below that visible to the average patient.
This version of the iPad test presents one letter per 0.1 log unit step, two letters per page. Scores should be similar to those obtained with the Pelli-Robson Chart. The test uses the same 10-letter set as the Bailey-Lovie Visual Acuity Chart.  
For more information visit

What's New in Version 1.2

New cover


screenshot 1
screenshot 2
Ridgevue Contrast Sensitivity Test
View in iTunes
  • $4.99
  • Available on iPad, iPhone and Mac.
  • Category: Medical
  • Published: Sep 17, 2015
  • Publisher: Ridgeve Vision
  • Seller: Ridgevue Vision LLC
  • Print Length: 14 Pages
  • Language: English
  • Version: 1.2
  • Requirements: This book can only be viewed on an iOS device with Apple Books on iOS 12 or later, or an iPad with iBooks 2 or later and iOS 5 or later, an iPhone with iOS 8.4 or later, or a Mac with OS X 10.9 or later.

Customer Ratings

We have not received enough ratings to display an average for this book.