Shiveta, Adhyapak (2009) Role of orthokeratology in refractive correction and an analysis of changes in corneal topography following overnight orthokeratology. Masters thesis, Madras Medical College, Chennai.
|
Text
2203001shivetaadhyapak.pdf Download (2MB) | Preview |
Abstract
The word ‘orthokeratology’ is derived from Greek roots and comes from ‘ortho’ meaning correct or proper and ‘keratology’ meaning having to do with the cornea. It thus means forming the cornea to a correct shape. Orthokeratology may also be considered to literally mean “the study of straight corneas”. Orthokeratology is defined as the reduction, modification or elimination of refractive error by the programmed application of specially designed rigid gas permeable contact lenses. It flattens the central anterior portion of the cornea, thus compensating for the abnormally long eye, in order to reduce or correct myopia. Our study demonstrates that overnight orthokeratology is a safe and effective method for the correction of myopia. This is in accordance with certain studies in literature.21,57,58,59 The central corneal flattening is consistent as evidenced by topography. The asphericity induced in the cornea during the treatment process does not significantly impair vision. Orthokeratology provides unaided clear vision for most part of the day in a majority of the patients. It is a viable nonsurgical alternative to refractive surgery. Orthokeratology improves the visual acuity over and above the best spectacle corrected visual acuity in patients with keratoconus who can tolerate RGP contact lenses. These lenses, when given for day-wear, do not induce any topographic changes in patients with keratoconus. Initiating orthokeratology at a younger age may have the beneficial effect of retarding the progression of myopia and significantly reducing the incidence of complications associated with pathological myopia.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Orthokeratology ; refractive correction ; corneal topography. |
| Subjects: | MEDICAL > Ophthalmology |
| Depositing User: | Devi S |
| Date Deposited: | 05 Sep 2017 12:06 |
| Last Modified: | 08 Sep 2017 01:12 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/2929 |
Actions (login required)
 |
View Item |
