Measuring visual function in age-related macular degeneration with frequency-doubling (matrix) perimetry

Area of Science:

• Ophthalmology
• Medical Devices
• Visual Psychophysics

Background:

• Age-related macular degeneration (AMD) is a leading cause of vision loss, primarily affecting central vision.
• Accurate assessment of visual field defects is crucial for managing AMD and monitoring disease progression.
• The Humphrey Field Analyzer (HFA) 10-2 is a standard tool, but newer perimeters like the Humphrey Matrix 10-2 offer potential advantages.

Purpose of the Study:

• To evaluate the agreement between the Humphrey Matrix perimeter 10-2 and the Humphrey Field Analyzer (HFA) 10-2.
• To determine the reliability of the Matrix 10-2 in assessing visual function in patients with age-related macular degeneration (AMD).

Main Methods:

• Forty-two eyes of 42 AMD patients were tested using both the Matrix 10-2 and HFA 10-2 visual field tests.
• Key metrics including Mean Deviation (MD), pattern standard deviation, and test time were recorded.
• Spatial concordance between the two tests was calculated by comparing the classification (normal vs. abnormal) of individual test locations.

Main Results:

• Both MD and pattern standard deviation showed strong correlations between the Matrix 10-2 and HFA 10-2 (r²=0.79 and r²=0.80, respectively).
• Median spatial concordance was 0.76, indicating similar spatial quantification of visual field defects.
• Fixation loss was significantly lower with the Matrix 10-2 (0%) compared to the HFA 10-2 (7%).

Conclusions:

• The Humphrey Matrix 10-2 test demonstrates comparable performance to the HFA 10-2 in quantifying central visual field loss in AMD.
• The Matrix 10-2 offers a reliable method for assessing visual function in AMD patients.
• Visual acuity alone provides only a modest prediction of the extent and depth of visual field defects in AMD.