Comparing Static Perimetry Protocols of Central Field Testing among Glaucoma Patients

Abstract

Significance 

On comparing the Humphrey Field Analyzer (HFA) HFA 24-2C Faster, which tests ten additional points in the central field with the 24-2 Swedish Interactive Thresholding Algorithm (SITA) Standard for detecting central field defects, we found that the HFA 24-2C Faster may be used for the initial field evaluation in glaucoma with the advantage of a shorter testing time.

Purpose 

To compare the HFA 24-2C Faster with 24-2 SITA Standard and 10-2 among glaucoma patients for the number of defective central points, global indices, and testing time.

Methods 

Sixty eyes of 60 patients with glaucoma and glaucomatous visual field defects on the 24-2 SITA Standard algorithm underwent the 24-2C Faster and 10-2 field tests. The number of central points detected, global indices, and reliability indices were compared for 24-2C Faster with 24-2 SITA Standard and 10-2 field tests.

Results 

The 24-2C Faster, on average, detected 5.5 defective points more on the total deviation plot and 2 defective points more on the pattern deviation plot than the 24-2 SITA Standard in central 10 degrees. The 10-2 algorithm detected 2.5 times more points on the total deviation plot than the 24-2C Faster. There was excellent consistency by intraclass correlation coefficient (ICC) of 0.95 for the mean deviation (MD) and 0.93 for the pattern standard deviation (PSD) between 24-2C Faster with the 24-2 SITA Standard. There was good consistency by ICC for MD and PSD being 0.80 for both between 24-2C Faster with the 10-2. The testing time was significantly lower with the 24-2C Faster compared to the 24-2 SITA Standard and 10-2 test.

Conclusion 

Our study demonstrates that the HFA 24-2C Faster may be used for the initial evaluation of the visual field in glaucoma with the added advantage of a shorter testing time compared with the 24-2 SITA Standard program.