Fixation Stability and Viewing Distance in Patients with AMD

Tarita-Nistor, Luminita; González, Esther G.; Brin, Taylor; Mandelcorn, Mark S.; Scherlen, Anne-Catherine; Mandelcorn, Efrem D.; Steinbach, Martin J.

doi:10.1097/opx.0000000000001018

Cited by 13 publications

(16 citation statements)

References 21 publications

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“…In lieu of age-matched controls, the control group in this study included participants with a wide age range. Age, however, was not found to be a significant covariate in our results and the fact that the deficits in eye position control in the patients were a function of pathology rather than age is consistent with previous reports [44,45]. Another effect of the age difference between the groups was the fact that the patients, being over 67 years old, were likely presbyopic while many of the controls were not.…”

Section: Discussionsupporting

confidence: 91%

“…Another effect of the age difference between the groups was the fact that the patients, being over 67 years old, were likely presbyopic while many of the controls were not. Blurred visual targets produced by poor accommodation, however, do not have a significant effect on fixation stability [45,46] and are not likely to have affected our findings. Finally, the sample size in this exploratory study was insufficient for determining the effects of interocular differences in terms of the scotoma's size, its position on the retina, its shape, density-and we suspect the type of maculopathy-on fixation stability in the dark.…”

Section: Discussionmentioning

confidence: 50%

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Effect of Visual Feedback on the Eye Position Stability of Patients with AMD

González

Mandelcorn

et al. 2019

Vision

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The sources of the reduced fixation stability exhibited by patients with central vision loss in the light are relatively well understood, but we have no information on how they control eye position in complete darkness, in the absence of visual error signals. We therefore explored the effect of visual feedback on eye position stability by testing patients with age-related macular degeneration (AMD) and controls with normal vision in the light and in complete darkness. Nine patients (ages 67 to 92 years) and 16 controls (ages 16 to 74 years) were tested binocularly in the light and in complete darkness while remembering the location of a now invisible target. Binocular eye position was recorded with a video-based eye tracker. Results show that eye position stability both in the light and in the dark is worse for patients than for controls and that, for the two groups, eye position stability in the dark is, on average, 5.9 times worse than in the light. Large instability of fixation in patients with AMD was found even in absolute darkness when the scotoma cannot impair vision. These data reflect permanent changes in the oculomotor reference of patients with AMD.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 50%

Effect of Visual Feedback on the Eye Position Stability of Patients with AMD

González

Mandelcorn

et al. 2019

Vision

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“…• 41% (29) of the sample showed binocular inhibition of MRS, 17% (12) of the sample had binocular equality and 42% (30) showed binocular summation…”

Section: Key Pointsmentioning

confidence: 99%

Binocular visual function and fixational control in patients with macular disease: A review

Micieli

Mandelcorn

Leibovitzh

et al. 2021

Ophthalmic Physiologic Optic

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“…These eye movements are widely researched in ophthalmology, neurology, psychology, cognitive science, and human factors ( Holmqvist et al, 2011 ; Laretzaki et al, 2011 ; Metsing and Ferreira, 2016 ; Krauzlis et al, 2017 ; Thielen et al, 2019 ). Eye movement anomalies associated with visual organic or functional anomalies, particularly fixation stability, may be present in amblyopia, nystagmus, maculopathy, myasthenia gravis, glaucoma, strabismus, and non-strabismic binocular vision disorders ( Subramanian et al, 2013 ; Otero-Millan et al, 2014 ; Mihara et al, 2017 ; Tarita-Nistor et al, 2017 ; Ghasia et al, 2018 ; Montesano et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of the Association Between Fixation Stability and Phoria During Short-Term Binocular Viewing

et al. 2022

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PurposeFixation stability for binocular anomalies with a phoria cannot be detected by direct observations. This study aimed to quantitatively evaluate fixation stability using an eye tracker rather than direct directions in binocular vision with abnormal and normal phorias.MethodsThirty-five and 25 participants with abnormal and normal phoria, respectively, were included in the study. The horizontal and vertical gaze points and convergence were recorded for 10 s using a remote eye tracker while binocularly viewing a target on a display screen 550 mm away. Fixation stability was quantified using bivariate contour ellipse areas (BCEA).ResultsThe fixation stability for all participants-based evaluations as a single cluster in the abnormal phoria group was lower than that in the normal phoria group (p = 0.005). There was no difference between the two groups in the evaluation based on the BCEA for each participant-based evaluation (p = 0.66). Fixation stability was also more related to convergence for the abnormal phoria group than for the normal phoria group (r = 0.769, p < 0.001; r = 0.417, p = 0.038, respectively).ConclusionAs the first study to evaluate fixation stability using an eye-tracker to differentiate between abnormal and normal phoria for non-strabismus, these findings may provide evidence for improving the evaluation of binocular vision not detected with clinical diagnostic tests.

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Fixation Stability and Viewing Distance in Patients with AMD

Abstract: Viewing distance does not affect fixation stability in patients with AMD. Fixation stability data recorded with an instrument at a fixed viewing distance can be related to performance on visual tasks at other viewing distances.

Cited by 13 publications

References 21 publications

Effect of Visual Feedback on the Eye Position Stability of Patients with AMD

Effect of Visual Feedback on the Eye Position Stability of Patients with AMD

Binocular visual function and fixational control in patients with macular disease: A review

Quantitative Evaluation of the Association Between Fixation Stability and Phoria During Short-Term Binocular Viewing

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