Blink Frequency and Duration during Perimetry and Their Relationship to Test–Retest Threshold Variability

Abstract

A wide range of blink frequencies was observed during perimetric testing. Although no blink parameters showed significant influence on threshold variability, when the blinks overlapped with a stimulus presentation, the probability of seeing was reduced. For suprathreshold stimuli, blinks often occurred after the presentation, whereas for subthreshold presentations, there was no relationship to presentation time.

The Usefulness of Gaze Tracking as an Index of Visual Field Reliability in Glaucoma Patients

“…Among the GT parameters analyzed in the current study, move 3-5 , move >6 , TFF, and BF were significantly associated with low MD values, probably because the patient was not well-fixated and could not see the target stimulus during blinking, as suggested in a previous report. 20 On the other hand, move 1-2 was not significantly related with MD values. This is unsurprising given the 68 spacing of VF test points in the 30-2 VF.…”

Estimating the Usefulness of Humphrey Perimetry Gaze Tracking for Evaluating Structure–Function Relationship in Glaucoma

“…Furthermore, a previous study has reported that eye movements of less than 38 are commonly observed in VF tests, even in well-trained healthy observers. 28,29 Surprisingly, move 3-5 had a larger coefficient than move ‡6 in the optimum formula. The reason for this is not clear, but we hypothesize that move 3-5 mainly reflects misfixations during the VF measurement whereas move ‡6 could be a result of a lack of concentration during the VF test.…”

Assessing Visual Fields in Patients with Retinitis Pigmentosa Using a Novel Microperimeter with Eye Tracking: The MP-3

“…[13] In perimeters without auto-tracking, such as the HFA, small (less than 3°) eye movements during the VF measurement cannot be avoided, even in well-trained healthy subjects. [16, 17] Thus, the Goldmann size III stimulus (with a diameter of 0.43 degrees) is projected onto the retina anywhere within at least 3 degrees of the designed location. This phenomenon is not observed with the MP-3, because its stimulus is projected onto a particular position of the retina, adjusted for eye movements according to perimeter’s auto-tracking function.…”