Parity Challenge: Amplifies brightness sense imbalance, designed to small defects 0.3 to 0.9 log units Can be used with any size defect.
For Ambyometer and Equalizer Games. Two tests are required: (1) First test the denser filter is over the right eye and (2) Second the denser filter is over the LEFT eye. During the testing dial-in RIGHT or LEFT when prompted, depending upon the side of the denser filter. The results of the two tests are compared, Normal is when the challenge Right eye produces a Left Eye defect and the Left eye challenge produces a Right eye defect within of equal or within 0.3 log units. See SlideShow below.
Compares the endpoints after adding a given neutral density filter first to one eye and then to the other eye, The Parity filter density adds to the defective side and subtracts from the unaffected side; doubling the size of the defect is the net effect. Parity Challenge filter required (sold separately).
Tap SlideShow to Play: Parity Challenge