The effect of age on binocular functions as measured by stereoacuity, fusion, ocular movements, and ocular alignment


Aims: To examine how binocular functions change with increasing age as measured by stereoacuity, motor fusion, ocular movements, near point of convergence (NPC), and ocular alignment. Methods: A preliminary questionnaire survey to establish the professionals’ views on whether age affects distance stereoacuity, fusion and NPC; and what the expected value of stereoacuity was for two age groups using Titmus, TNO and Frisby stereotests. A prospective single-centre cohort study was performed on 77 normal participants aged 10 - 79 years measuring ocular alignment, ocular motility, NPC, motor fusion, and stereoacuity (with Titmus, TNO, Frisby, and Frisby-Davies distance stereotests). Results: The preliminary study results confirmed there was a gap in knowledge regarding any association between age and fusion, and between age and stereoacuity. From the cohort study, all stereotests showed a statistically significant decline in stereoacuity with increasing age (p < 0.05). As age increases NPC declines, this was a statistically significant change (p < 0.05); one year increase in age yielded a 0.032 cm decline in NPC. Age-related changes in positive distance fusion were found- as age increases distance positive fusion declines, which was a statistically significant change (p < 0.05). Age-related changes in positive near fusion, negative near fusion, negative distance fusion, vertical near fusion, vertical distance fusion, ocular alignment, and ocular motility were not found. Conclusions: Overall, stereoacuity was affected by age, but this study challenges the view that other aspects of a binocular vision examination are affected by increasing age. The normative data will provide a baseline from which to compare outcomes in clinical situations.

Divisions: College of Health & Life Sciences > School of Optometry > Optometry
Additional Information: © Geraldine McBride, 2021 asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately.
Institution: Aston University
Uncontrolled Keywords: Age,binocular functions,stereoacuity,fusion
Last Modified: 08 Dec 2023 08:58
Date Deposited: 28 Oct 2021 12:31
Completed Date: 2021
Authors: McBride, Geraldine



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