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Eye Conditions |
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The Brien Holden Vision Institute undertakes research focused on understanding and developing solutions to refractive errors, which collectively impair the vision of billions of people around the world (myopia alone presently affects 1.6 billion).
Refractive errors are caused by the inability of the cornea and lens of the eye to bend (refract) light accurately. Someone with a refractive error will experience blurred vision at some distance. Refractive errors are usually corrected with devices such as spectacles or contact lenses.
The most common refractive errors are myopia (short-sightedness), presbyopia (a progressive hardening of the lens with age resulting in the inability to focus on close objects), astigmatism (blurred vision caused by irregular curvature of the front surface of the eye) and hyperopia (long-sightedness).
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Myopia |
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Myopia, also known as 'short-sightedness' or 'near-sightedness', causes people to have difficulty seeing distant objects clearly. There are currently 1.6 billion myopic people in the world, a figure that is growing rapidly.
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Presbyopia |
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Presbyopia means ‘old sight’. When we read or look at something close, the flexible lens of the eye changes shape to provide the close focus required. However, as we age, the lens becomes less flexible and its ability to change shape is reduced.
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Astigmatism |
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Astigmatism is a condition in which objects are blurred more in one direction than another and is caused by an irregular shape of the lens or the front surface (cornea) of the eye. It can be corrected by spectacles or contact lenses, or may not require correction in mild cases. Astigmatism may occur together with myopia or hyperopia.
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Hyperopia |
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Hyperopia is also known as long-sightedness. People with hyperopia have blurred near vision but distance vision may be clear. The hyperopic eye is shorter than the normal eye, meaning that light focuses behind the back of the eye (the retina) rather than on it, causing blurred vision. Hyperopia can be corrected with spectacles or contact lenses, or may not require correction in mild cases. |
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Complications Associated With Contact Lenses |
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The eye has a range of natural defence systems which very effectively protect the eye’s tissues from inflammation and infection. The placement of a contact lens on the eye, however, places an added burden on these systems, which can sometimes result in an adverse response or event.
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