Parity Challenge: Amplifies an Imbalance
For Ambyometer and Equalizer Games. First the game (test) is played with the parity filter over one eye and then the game is repeated with the parity filter over the opposite eye. The results of the two tests are compared.
Compares the endpoints after adding a given neutral density filter first to one eye and then to the other eye, The Parity filter adds to the defective side and subtracts from the unaffected side; doubling the size of the defect is the net change. Confirms and amplifies the afferent defect. Useful for confirm a small defect of 0.3 or 0.6. Parity Challenge filter required (sold separately)