Evaluation of adaptive spatial enhancement in suprathreshold visual field screening

Area of Science:

• Ophthalmology
• Visual Psychophysics

Background:

• Glaucoma diagnosis relies on detecting visual field defects.
• Standard screening methods aim to efficiently identify potential abnormalities.

Purpose of the Study:

• To evaluate a spatially adaptive suprathreshold screening program for central visual field testing.
• To assess if spatial enhancement improves sensitivity and specificity compared to standard screening.

Main Methods:

• Tested 63 normal subjects and 94 glaucoma patients using Humphrey field analyzer.
• Employed a threshold-related, eccentricity-compensated, suprathreshold screening program with spatial enhancement.
• Compared screening results with a full-threshold program.

Main Results:

• Spatial enhancement strategy did not improve screening sensitivity or specificity.
• Missed points on screening often correlated with shallow, depressed sensitivity on threshold testing.
• This pattern of shallow defects occurred in both normal and abnormal subjects.

Conclusions:

• The tested spatial enhancement strategy offers no advantage over standard screening point selection.
• Persistent shallow defects in normal subjects raise questions about the diagnostic significance of "confirmed" defects.
• Rethinking diagnostic criteria for visual field defects may be necessary.