Metamorphopsia

Reference: PVM-ME

Metamorphopsia and ARMD

The early detection and intervention are important to prevent or delay vision loss in age related macular degeneration (ARMD).
Retinal metamorphopsia occur in the early stage of ARMD as a result of elevations of the pigment epithelium.
These metamorphopsia are usually evaluated with the Amsler chart. However, this test suffers from several limitations including the difficulty of self reporting, the absence of fixation monitoring, the absence of quantification and problems with filling-in phenomenon.		 eye fundus in ARMD

result of amsler test
Methodology This program provides an automated detection of metamorphopsia and the follow-up of their evolution.
It is designed to overcome the problems encountered with the Amsler chart.
The test is similar to a perimetry test. Local patterned stimuli are presented in a pseudo random sequence and the patient task is to indicate whether the pattern is distorted or not.
The program starts with a training phase. The following examination phase includes 31 different test locations. An additional phase can be added for 16 additional locations. The test duration is about 90 seconds for the first phase including controls for attention and fixation errors. The complete test duration, including the second examination phase is about 150 seconds.

This program is available on the Moncv3 and MonPack3 multifunction Vision Monitor systems. These systems include a built-in fixation monitoring device. A standard PC operating under Windows XP or Vista is used for the control of the instrument as well as for the storage and printout of results. 		test of metamorphopsia by metrovision
Quantitative analysis

The program provides a standardized report including a map of probability of altered locations and the total percentage of locations with alterations.		 test of metamorphopsia by metrovision
Follow-up

The program searches the data base for all the results from the same patient and plots the evolution of the score over the last exams.
Comparison with eye fundus

The program allows the comparison of the metamorphopsia with the eye fundus. The image of the eye fundus is imported as an image file either through the computer network or by USB key, CDROM etc. The operator identifies by a simple click the position of the fovea and papilla and the program automatically performs the scaling and repositioning the eye fundus image.

Vision Monitor systems compatible with this program:

Additional information: