Effect of Visual Feedback on the Eye Position Stability of Patients with AMD
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 visu...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-11-01
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| Series: | Vision |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2411-5150/3/4/59 |
| _version_ | 1818361519618916352 |
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| author | Esther G. González Mark S. Mandelcorn Efrem D. Mandelcorn Luminita Tarita-Nistor |
| author_facet | Esther G. González Mark S. Mandelcorn Efrem D. Mandelcorn Luminita Tarita-Nistor |
| author_sort | Esther G. González |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T21:17:59Z |
| format | Article |
| id | doaj.art-b8683209c51544279546931631ded0cf |
| institution | Directory Open Access Journal |
| issn | 2411-5150 |
| language | English |
| last_indexed | 2024-12-13T21:17:59Z |
| publishDate | 2019-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Vision |
| spelling | doaj.art-b8683209c51544279546931631ded0cf2022-12-21T23:31:11ZengMDPI AGVision2411-51502019-11-01345910.3390/vision3040059vision3040059Effect of Visual Feedback on the Eye Position Stability of Patients with AMDEsther G. González0Mark S. Mandelcorn1Efrem D. Mandelcorn2Luminita Tarita-Nistor3Krembil Research Institute, Toronto Western Hospital, Toronto, ON M5T 2S8, CanadaDepartment of Ophthalmology & Vision Sciences, University of Toronto, Toronto, ON M5T 2S8, CanadaDepartment of Ophthalmology & Vision Sciences, University of Toronto, Toronto, ON M5T 2S8, CanadaKrembil Research Institute, Toronto Western Hospital, Toronto, ON M5T 2S8, CanadaThe 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.https://www.mdpi.com/2411-5150/3/4/59fixation stabilityeye position stabilityvisual feedbackage-related macular degenerationcentral vision loss |
| spellingShingle | Esther G. González Mark S. Mandelcorn Efrem D. Mandelcorn Luminita Tarita-Nistor Effect of Visual Feedback on the Eye Position Stability of Patients with AMD Vision fixation stability eye position stability visual feedback age-related macular degeneration central vision loss |
| title | Effect of Visual Feedback on the Eye Position Stability of Patients with AMD |
| title_full | Effect of Visual Feedback on the Eye Position Stability of Patients with AMD |
| title_fullStr | Effect of Visual Feedback on the Eye Position Stability of Patients with AMD |
| title_full_unstemmed | Effect of Visual Feedback on the Eye Position Stability of Patients with AMD |
| title_short | Effect of Visual Feedback on the Eye Position Stability of Patients with AMD |
| title_sort | effect of visual feedback on the eye position stability of patients with amd |
| topic | fixation stability eye position stability visual feedback age-related macular degeneration central vision loss |
| url | https://www.mdpi.com/2411-5150/3/4/59 |
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