THE QUALITY OF EYESIGHT BETWEEN THEORY AND PRACTICE
The technological evolution allowed the standardization of cataract surgery from a practical point of view. The replacement of the affected eye lens is followed by implanting a foldable artificial eye lens which refractively restores the ocular diopter. The current challenge is the best quality of e...
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| Main Authors: | , |
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| Format: | Book |
| Published: |
Romanian Society of Oral Rehabilitation,
2014-07-01T00:00:00Z.
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| Summary: | The technological evolution allowed the standardization of cataract surgery from a practical point of view. The replacement of the affected eye lens is followed by implanting a foldable artificial eye lens which refractively restores the ocular diopter. The current challenge is the best quality of eyesight. The eyesight is a complex process in which the perception of visual stimulations is determined by numerous factors: anatomical, optical, neurological perception and processing. There is also a great variety of adjusting mechanisms that compensate the errors which may occur in the optic system (the Stiles-Crawford effect). The only factor that a cataract surgery can have an impact on is the optical factor. The main causes for optical quality decrease of a system are diffraction, aberrations and dispersion. These three phenomena cause an image of a dot to produce a diffuse circle on the retina. 90 % are low order aberrations (canting, defocusing, astigmatism) that are usually eliminated through a biometry and a thorough surgical technique. There are also high order aberrations, though, that affect the quality of eyesight, such as spherical aberration and coma. |
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| Item Description: | 2066-7000 2601-4661 |