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Inventors: Hecht & Hofeldt
*1921 Fovea Adaptation by Dr. Selig Hecht
*2021 Relative Fovea Adaptation by Dr Albert Hofeldt
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*100 years between Hecht and Hofeldt Methods, see Video below:
Two Inventors Making the Fovea Testable
Press Release 1/15/2026
1st Relative FOVEAL Adaptation
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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.
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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
Add Parity Filter to Left Eye and Test, then add Parity Filter to Right Eye and Test. Amplifies the Defect
Dial-in RIGHT Eye.
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.
Preview of the result appears in the lower right corner appears the result, 0.6 OD
Dial-in the LEFT eye prior to testing.
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.
Preview of the result appears in the right lower corner, 1.2 OS.
Shows Parity Glasses with Right or Left lens darkened to indicate the side of the filter.
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