Doctoral theses
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| Identifier |
000461792 |
| Title |
Eye movement-based analysis in reading : A method for evaluating functional vision in normal ageing,presbyopia correction and in retinal diseases |
| Alternative Title |
Ανάλυση οφθαλμικών κινήσεων κατά τη διάρκεια ανάγνωσης |
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Author
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Κτιστάκης, Εμμανουήλ
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Thesis advisor
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Τσιλιμπάρης, Μιλτιάδης
Σίμος, Παναγιώτης
Δετοράκης, Ευστάθιος
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Reviewer
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Σιγανός, Χαράλαμπος
Τσικνάκης, Μανόλης
Μουζάκη, Αγγελική
Κρασανάκης, Βασίλειος
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| Abstract |
Visual acuity assessment is the preferred first-line test among clinicians to evaluate the
integrity of the visual system. However, simple measures of near acuity, while of interest, may
provide only a partial indication of functional vision and of the effectiveness of surgical or
optical corrections. Since many activities of daily living rely on reading it is not surprising that
reading difficulty is the most common complaint among individuals with decreased vision,
while it forms the primary reason for patients to seek referral to a low vision clinic and a
strong predictor of vision-related quality of life.
Reading, however is a complex function. It requires a proper retinal image and intact retina
to send information to the brain, where the image is analyzed for extraction of meaning. Thus
it is difficult to evaluate functional vision based on reading performance. The evolution of eye
trackers, new standardised reading tests and computational and statistical methods have given
valuable tools to further analyse reading performance through eye movement parameters.
The aim of this work is to use eye movement analysis during text reading to evaluate functional
vision under different conditions. It is divided into four studies involving: assessment
of method repeatability, applications to age-related macular disease, anti-VEGF treatment, and
presbyopia correction, as well as the study of reading comprehension.
A secondary aim is to find certain eye movement parameters that are distinctly affected
under each condition and factor. In this context, the ex-Gaussian analysis is used to evaluate
the fixation duration distribution.
The results highlight certain distinct effects of specific factors on eye movement and ex-
Gaussian parameters. Ex-Gaussian parameter τ, the percentage of regression and the number
of forward fixations were affected by cognitive (higher-level) processes while ex-Gaussian μ,
fixation duration and the number of fixations were mainly affected by optical (lower-level)
factors.
In the future, studies of specifically manipulated changes in certain factors have to be
performed. More refined computational methods and machine learning approaches could
provide more thorough analysis of eye movement parameters during reading.
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| Language |
English |
| Subject |
Οφθαλμικές κινήσεις |
| Issue date |
2024-04-17 |
| Collection
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School/Department--School of Medicine--Department of Medicine--Doctoral theses
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Type of Work--Doctoral theses
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| Permanent Link |
https://elocus.lib.uoc.gr//dlib/6/7/2/metadata-dlib-1706009647-527608-30710.tkl
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| Views |
3 |
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