| refractive keratoplasty | Any procedure in which the shape of the cornea is modified, with the intent of changing the refractive error of the eye; for example, if the cornea is flattened, the eye becomes less myopic. See: photorefractive keratectomy, keratophakia, lamellar keratoplasty, thermokeratoplasty, keratomileusis, radial keratotomy. Synonym: keratorefractive surgery. (05 Mar 2000) |
|---|
| refractive | Serving or having power to refract, or turn from a direct course; pertaining to refraction; as, refractive surfaces; refractive powers. Refractive index. <medicine> The ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray passing out of one of the media into the other. Origin: Cf. F. Refractif. See Refract. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| refractive accommodative esotropia | That type of esotropia eliminated by correction of hypermetropic refractive error. (05 Mar 2000) |
| refractive amblyopia | A suppression of central vision due to an unequal refractive error (anisometropia) of at least two diopters. This induces a sufficient difference in image size (aniseikonia) that the two images cannot be fused. In order to avoid confusion, the blurrier image is suppressed. Synonym: refractive amblyopia. (05 Mar 2000) |
| refractive errors | Deviations from the average or standard indices of refraction of the eye through its dioptric or refractive apparatus. (12 Dec 1998) |
| refractive index | <microscopy> The ratio of the velocity of light in a vacuum to the velocity in some medium. Refractive index generally increases with the atomic number of the constituent atoms. (05 Aug 1998) |
| refractive keratotomy | Modification of corneal curvature by means of corneal incisions to minimise hyperopia, myopia, or astigmatism.In this type of radial keratotomy surgery, performed by excimer laser, pie-shaped pieces of cornea are removed under local anaesthetic. The resulting scar tissue formation reshapes the cornea. This class of surgery is somewhat unpredictable, and its long-term effects are still unknown. (05 Mar 2000) |
| allopathic keratoplasty | Corneal transplant with donor material of glass, plastic, or other inert material. (05 Mar 2000) |
| autogenous keratoplasty | Corneal transplant with donor material from the same individual. (05 Mar 2000) |
| penetrating keratoplasty | Corneal transplant with replacement of all layers of the cornea, but retaining the peripheral cornea. Synonym: perforating keratoplasty. (05 Mar 2000) |
| perforating keratoplasty | Corneal transplant with replacement of all layers of the cornea, but retaining the peripheral cornea. Synonym: perforating keratoplasty. (05 Mar 2000) |
| heterogenous keratoplasty | Corneal transplant with donor material from another species. (05 Mar 2000) |
| homogenous keratoplasty | Corneal transplant with donor material from another individual of the same species. (05 Mar 2000) |
| nonpenetrating keratoplasty | Keratoplasty in which only the anterior layer of the cornea is used (not a tectonic keratoplasty). Synonym: lamellar keratoplasty, layered keratoplasty. (05 Mar 2000) |
| optical keratoplasty | Transplantation of transparent corneal tissue to replace a leukoma or scar that impairs vision. (05 Mar 2000) |
| tectonic keratoplasty | Grafting to replace lost corneal tissue. (05 Mar 2000) |