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)

Tutorial Gallery

Parity Challenge Example
Parity Challenge Example

Add Parity Filter to Left Eye and Test, then add Parity Filter to Right Eye and Test. Amplifies the Defect

Choose Right Eye Challenge
Choose Right Eye Challenge

Dial-in RIGHT Eye.

Put on RIGHT Parity Glasses
Put on RIGHT Parity Glasses

The 0.9 log filter dims the right eye. With a 0.3 left eye defect, the right eye is now dimmer by 0.6 log units. The result will 0.6 OD.

Result 0.6 OD Defect
Result 0.6 OD Defect

Preview of the result appears in the lower right corner appears the result, 0.6 OD

Left Eye Challenge
Left Eye Challenge

Dial-in the LEFT eye prior to testing.

Put on LEFT Parity Glasses
Put on LEFT Parity Glasses

The 0.9 log filter dims the left eye. With a 0.3 left eye defect, the left eye is now dimmer by 1.2 log units. The result will 1.2 OS.

Result 1.2 OS Defectt
Result 1.2 OS Defectt

Preview of the result appears in the right lower corner, 1.2 OS.

Results Page
Results Page

Shows Parity Glasses with Right or Left lens darkened to indicate the side of the filter.

PDF format results
PDF format results

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