FEATURES

  • Quickly and accurately measures contrast sensitivity functionality while eliminating technician bias and erroneous results
  • FIXED SIZE: Letters are displayed at 20/100 size and begin at 10% contrast (-1.0 log) and will decrease -0.1 log steps
  • FIXED CONTRAST: User can select 1.2%, 2.5%, 5%, 10% and 25% contrast levels
  • Choose Sloan letters (10) or British Standard Institution letters (12)
  • Each presentation is randomized thereby eliminating the memorization effect and is consistent and repeatable
  • System calibration is set in meters at virtually any distance and is adjustable and precise to within 1 cm
  • The system is calibrated for both distance-to-subject and pixels-per-inch so that optotypes precisely follow ANSI Z80.21-2020 and ISO 8596:2017 regarding size, spacing between optotypes, and spacing between lines
  • Background luminance is accurately calibrated to 85 cd/m2 for standardized ANSI and ISO testing but may be changed to any other background luminance from 80 to 320 cd/m2 as required for a study
  • Mesopic testing at 3 cd/m2 is available by utilizing a neutral density filter
  • ETDRS results indicate ETDRS numerical score, visual acuity level and logMAR value
  • Test results include a contrast percent that can be exported to any media file in any format for statistical analysis
  • Letter contrast system luminance can be automatically calibrated and ambient room conditions measured with the optional integrated luminance meter

USE & OPERATION

  • The system is controlled by a high-resolution tablet via a standard Bluetooth connection utilizing our CustomLink® technology
  • The testing mechanism interfaces seamlessly with CTS (Clinical Trial Suite) to allow the clinician to follow the protocol as determined by the sponsor
  • FIXED SIZE: A 3-line contrast chart is presented at 20/100 using five (5) letters across and starting at 10% contrast
  • FIXED CONTRAST: A descending ETDRS type logMAR letter contrast chart is presented at preselected 1.2%, 2.5%, 5%, 10% or 25% contrast levels
  • FIXED SIZE: The subject responds with the faintest line where all five letters can be correctly identified and the technician simply enters the line number and presses “Submit”
  • FIXED CONTRAST: The subject responds with the smallest line where all five letters can be correctly identified and the technician simply enters the line number and presses “Submit”
  • The chart then randomizes, setting the selected line to the top line and a pointer is shown at the next lighter line (Fixed Size) or next smaller line (Fixed Contrast)
  • The subject is then asked to read this line, and the number of correct letters is input; the pointer moves to the next line
  • The test continues until the subject is no longer able to identify any correct letters on a line
  • When the test is complete the results are reported in the standard ETDRS Letter Score, contrast percent and logMAR equivalent

HARDWARE OPTIONS

M&S Smart System® 20/20 USA All-in-One Computer

  • High-resolution 22” display
  • Designed and developed by M&S in Niles, IL
  • Manufactured in the USA (applies to SS-2020-USA)
  • Industrial grade componentry ensures longer product lifespan compared to computers built for the retail/consumer market
  • USA technical support based in-house at M&S in Niles, IL
  • Extended 3-year warranty

Touch-Screen Laptop

  • High-resolution 13” display
  • Lightweight and portable
  • USA technical support based in-house at M&S in Niles, IL
  • 2-year warranty