MediWorks C901 17-Inch Digital Vision Chart

The MediWorks C901 is a 17-inch digital vision chart designed to support visual-acuity testing, refraction and binocular-vision examinations in ophthalmology and optometry practices.

Its Linux-based software renders optotypes and charts as vector graphics. When the operator changes the testing distance or another parameter, the system redraws the optotypes at the appropriate size to maintain the selected visual-acuity scale.

The C901 includes letter, number, Tumbling E, Landolt C, pediatric and Allen Picture optotypes. It also provides ETDRS, contrast sensitivity, Ishihara, astigmatic fan, cross-cylinder, Worth Four-Dot, Schober, red/green balance, fixation and stereo tests.

Testing distances can be configured from 2 to 7 meters or 6 to 24 feet. A separate low-vision mode supports distances from 0.4 to 1.5 meters.

The quick-test function allows practitioners to create a customized list of up to ten frequently used tests. Optotype randomization, masking options and a V-style arrangement support efficient examinations and help reduce memorization or visual crowding.

The mirror function permits installation in examination rooms that use a reflective optical path. The system also supports image viewing, video playback, screen saver, standby mode and gamma calibration for contrast-sensitivity testing.

Key Features

• 17-inch XGA display with LED backlighting
• Resolution of 1280 × 1024 pixels
• Vector-based optotypes and charts
• Linux-based operating platform
• Adjustable working distance
• Multiple visual-acuity notation systems
• Adult and pediatric optotypes
• Comprehensive special-test library
• CNT test with on-screen curve
• Customized quick-test list
• V-style optotype arrangement
• Randomized optotype presentation
• Single, horizontal and vertical masks
• Red/green and contrast masks
• Mirror-room function
• Adjustable red and green values
• Gamma calibration
• Image and video playback
• Infrared remote control
• Wall-mount bracket included
• Optional desktop support and floor stand

Optotypes and Tests

Optotypes

• Tumbling E
• Landolt C
• Alphabet
• Numbers
• Children’s symbols
• Allen Pictures
• Normal and uncrowded presentations
• Low-vision optotypes

Masking Options

• Background change
• Single-character mask
• Horizontal mask
• Vertical mask
• Red/green mask
• Contrast mask

Special Tests

• CNT test
• ETDRS
• Contrast-sensitivity test
• Contrast test
• Ishihara color test
• Cross-cylinder test
• Astigmatic fan
• Cross grid
• Fixation spot
• Stereo test
• Red/green panel
• Worth Four-Dot test
• Red/green balance
• Traffic-light test
• Horizontal coincidence
• Vertical coincidence
• Schober test