MassVAT Designed by: Luisa Mayer, Ph.D. and Bruce Moore, O.D.
Two smaller groups 4.8M to 2.4M for repetitive eyesight testing (20/32, 6/9.5 to 20/16, 6/4.8 equiv.).
Can be wall-mounted.
Patti Pics are stylized pictures designed by Precision Vision on the basis of the 5×5 Snellen grid, and calibrated for equal recognizability against Sloan letters. Visual acuity readings should not change appreciably when children are advanced from Patti Pics to a regular letter chart. This calibration helps to lessen the mistaken loss or gain of lines. Did you know that if a proportionally spaced chart is too difficult for your patients, try using a chart containing a MassVAT format. Testability using the MassVAT format in young children is high. The rectangular outline surrounding the five optotypes is 50% of the width of the optotype. Thus, it provides adequate contour interaction to detect Amblyopia.