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Perceptual Tests Test to see how a person processes and understands visual information. These are often used to see how best a person learns. Some people like to learn by being presented with a big picture all in one go while others prefer to learn in a sequential way with each element required being presented in a consecutive and logical order. Most people learn by a combination of thee processes but some with learning problems will only be able to use one or the other. |
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Peripheral Vision The ability to see or be aware of the vision around about us or to the sides. defects in this ability can be caused by diseases such as glaucoma, tumours, retinal detachments and strokes to name but a few. Good peripheral vision is essential in driving, most sports and reading. Peripheral vision can be tested using visual field testing instruments. |
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Pursuit Eye Movements The ability to move the eye to remain in accurate visual contact with a moving object within the visual field. This is complicated by the ability to perform this task not only when the head and body are stationary, but also, when the head and body are moving. |
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Refraction The part of an eye examination that determines the refractive error. |
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Refractive error The measure of the error of focus of an eye compared to an assumed normal point of zero. The error is measured in diopters which is the reciprocal of the focal length in centimeters. The refractive error will include measurements for myopia (nearsighted), hyperopia (far sighted), astigmatism (distorted vision, typically caused by an abnormally shaped cornea), and presbyopia (the loss of focusing power due to age for near work). |
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