Near-sightedness, also known as myopia and short-sightedness, is an eye disease where light focuses in front of, instead of on, the retina. As a result, distant objects appear blurry while close objects appear normal.Other symptoms may include headaches and eye strain.Severe near-sightedness is associated with an increased risk of retinal detachment, cataracts, and glaucoma.
Myopia results from the length of the eyeball growing too long or less commonly the lens being too strong. It is a type of refractive error. Diagnosis is by eye examination.
This video talks in detail about what is myopia. what are the various types and classifications of myopia. myopia can be classified based on duration, progression, degree of myopia, onset and special types of myopia.
The degree of myopia is described in terms of the power of the ideal correction, which is measured in diopters:[
Myopia between −0.00 and −0.50 diopters is usually classified as emmetropia.
Low myopia usually describes myopia between −0.50 and −3.00 diopters.
Moderate myopia usually describes myopia between −3.00 and −6.00 diopters. Those with moderate amounts of myopia are more likely to have pigment dispersion syndrome or pigmentary glaucoma.
High myopia usually describes myopia of −6.00 or more. People with high myopia are more likely to have retinal detachments and primary open angle glaucoma. They are also more likely to experience floaters, shadow-like shapes which appear in the field of vision. In addition to this, high myopia is linked to macular degeneration, cataracts, and significant visual impairment.
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#refraction
#ophthalmology
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