ONLINE CE
Introduction to Aniseikonia and Aniseikonia Management with optical and contact lens correction
Introduction to Aniseikonia and Aniseikonia Management with optical and contact lens correction
Speaker:
Dr Gerard de Wit Date: 28 Oct 2021(Thur) Time: 20:30-21:30 CPD: 1.0 CPD hour HKAOK member:
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Biography
Dr. Gerard de Wit is a medical physicist that lives in Beusichem, the Netherlands. His educational background is in applied physics and clinical physics with his postgraduate medical physics program from the Dutch Medical Physicist Training Foundation in the Visual system group.
He has done extensive visual and optical consultancy in optical engineering and research. Dr de Wit has worked with many international institutes and companies including Schepens Eye Research Institute (Boston, USA), McGill University (Montreal, Canada), Microvision (Seattle, USA), Multilens Optical Solution (Sweden), etc.
Gerard’s work include exit pupil in virtual reality display, pupil relay optics in retinal scanning displays, eye tracking, crowding ratios, straylight effects on cataracts, free form spectacles lenses and so on. He also has a few publications on aniseikonia before founding Optical Diagnostics where he focuses on technical software development and optical design.
Dr. Gerard de Wit is a medical physicist that lives in Beusichem, the Netherlands. His educational background is in applied physics and clinical physics with his postgraduate medical physics program from the Dutch Medical Physicist Training Foundation in the Visual system group.
He has done extensive visual and optical consultancy in optical engineering and research. Dr de Wit has worked with many international institutes and companies including Schepens Eye Research Institute (Boston, USA), McGill University (Montreal, Canada), Microvision (Seattle, USA), Multilens Optical Solution (Sweden), etc.
Gerard’s work include exit pupil in virtual reality display, pupil relay optics in retinal scanning displays, eye tracking, crowding ratios, straylight effects on cataracts, free form spectacles lenses and so on. He also has a few publications on aniseikonia before founding Optical Diagnostics where he focuses on technical software development and optical design.
Abstract
Aniseikonia is a binocular condition in which the two eyes perceive images of different size. This can be either static (present with a fixed gaze direction) or dynamic (each eye need to rotate a different amount to view the same point in space). Dynamic aniseikonia is also called optically-induced anisophoria.
The symptoms experienced by aniseikonia patients are rather general, with headache and asthenopia the most frequent. Because of the general nature of the symptoms, it is sometimes difficult for the optometrist to recognize the aniseikonia condition.
The main patient groups at risk of aniseikonia are anisometropes, pseudophakes, refractive surgery patients, and patients with retinal conditions such as an epiretinal membrane, macular edema, retinal detachment, or retinoschisis. In the patients with a retinal condition the aniseikonia is caused by a spatial rearrangement of the photoreceptors causing a certain image to fall on more or less retinal receptors. Since the retinal condition usually applies to only part of the retina, the retinally-induced aniseikonia will be variable across the visual field.
The 3 steps process (measure, verify, and prescribe) for Aniseikonia management will be presented. Management includes adjustment of magnification properties of the optics in front of both eyes by changing spectacle parameters like the base curve, lens thickness, refractive index, and vertex distance or by creating a weak telescope in front of one eye by a combination of one contact lens + spectacle lenses.
In this presentation some literature and cases will be discussed showing, for example, that with anisometropia contact lenses often give a better correction than spectacle lenses (even though the images on the retina might be more different in size). Also, it will be shown that even though retinally-induced aniseikonia is field dependent, patients might still benefit from a partial aniseikonia correction.
Aniseikonia is a binocular condition in which the two eyes perceive images of different size. This can be either static (present with a fixed gaze direction) or dynamic (each eye need to rotate a different amount to view the same point in space). Dynamic aniseikonia is also called optically-induced anisophoria.
The symptoms experienced by aniseikonia patients are rather general, with headache and asthenopia the most frequent. Because of the general nature of the symptoms, it is sometimes difficult for the optometrist to recognize the aniseikonia condition.
The main patient groups at risk of aniseikonia are anisometropes, pseudophakes, refractive surgery patients, and patients with retinal conditions such as an epiretinal membrane, macular edema, retinal detachment, or retinoschisis. In the patients with a retinal condition the aniseikonia is caused by a spatial rearrangement of the photoreceptors causing a certain image to fall on more or less retinal receptors. Since the retinal condition usually applies to only part of the retina, the retinally-induced aniseikonia will be variable across the visual field.
The 3 steps process (measure, verify, and prescribe) for Aniseikonia management will be presented. Management includes adjustment of magnification properties of the optics in front of both eyes by changing spectacle parameters like the base curve, lens thickness, refractive index, and vertex distance or by creating a weak telescope in front of one eye by a combination of one contact lens + spectacle lenses.
In this presentation some literature and cases will be discussed showing, for example, that with anisometropia contact lenses often give a better correction than spectacle lenses (even though the images on the retina might be more different in size). Also, it will be shown that even though retinally-induced aniseikonia is field dependent, patients might still benefit from a partial aniseikonia correction.