ForeseeHome™ - AMD Monitoring Program

Deficiencies of Amsler Grid

Deficiencies of the Amsler Grid

Until now, the only home monitoring method has been the Amsler grid.  When distortion is noticed on the Amsler grid, vision loss has already progressed.

ForeseeHome® utilizes technology that overcomes many limitations of the Amsler grid:



Amsler Grid





Utilizes technology that can identify visual defects before the brain can complete the missing information.

The brain automatically completes missing information, therefore masking some visual defects.


Utilizes technology that can accurately detect peripheral distortions.

The brain can mask subtle distortions that might appear at the grid’s periphery.


Overcomes fixation problems by randomly flashing visual stimuli that prevent scanning with the fovea.

The eye involuntarily scans the entire grid, including the periphery, limiting fixation.

Stable Environment

Able to control lighting, distance, which eye is tested, and occlusion of the other eye

Unable to control the viewing environment


None – Doctor is automatically notified when a statistically significant change is detected.

Relies on patient to notice and report distortions.



Notal Vision monitors activity and contacts patient after 7 consecutive days without data transmission.

Often poor and difficult to verify.


1. Loewenstein A, Ferencz JR, Lang Y, et al. Toward earlier detection of choroidal neovascularization secondary to age-related macular degeneration: multicenter evalutation of a preferential hyperacuity perimeter designed as a home device. Retina. 2010;30:1058-1064.  2. Loewenstein A, Malach R, Goldstein M, et al. Replacing the Amsler grid: a new method for monitoring patients with age-related macular degeneration. Ophthalmology. 2003;110:966–970.