Abstract
Amblyopia is the most commonly found monocular visual impairment in the world. This paper presents an initial investigation into developing a visual aid for monocular visual impaired patients. The investigations conducted in this paper include those from direct interviews from consultant ophthalmologist. Investigations include reviewing the principle required to be embedded into the visual aid such as the distance and depth perception. Stereoscopic cameras and algorithms are also further discussed to interlink with the concepts of depth perception. Monocular visual impairment can most of the time be caused by medical conditions like amblyopia or glaucoma, and rarely caused by accidents and external factors. Thus, existing treatments for amblyopia, the effectiveness and challenges of the treatment are also clearly investigated and scrutinized in this paper. Some of the existing treatments include refractive therapy, occlusion therapy, atropine injections, perceptual learning, pharmacological treatment and acupuncture. This study has provided a clear insight into the requirements of developing a visual aid, thus further addressing the challenges faced by the treatments in this impairment.
Highlights
It is to be noted that amblyopic vision loss cannot be treated later on in life and adults with amblyopic visual impairment have no option of treatment but to live with the state they already are until the time of death [2]
The gap found in this review is to produce a visual aid with increased field of vision and depth perception
We have presented the challenges faced by the existing treatments for amblyopia patients as most monocular visual impairment is caused by this medical condition
Summary
Distance and depth perception is a vital ability required by a human to carry out simple daily tasks such as walking on a street or even crossing the road. The absence of this ability might lead to unwanted calamities. Its been clearly published by The National Institute for Rehabilitation Engineering (NIRE) on visual distance and depth perception that partially monocular people cannot drive with complete safety. This is because the image from the blurred eye on the person will superimpose the image produced by the sound eye. The special lenses are able to partially or completely occlude the vision [6]
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