Quantitative chemical analysis harris 8th pdf

The degree of astigmatism must be 3. The member must be intolerant of glasses quantitative chemical analysis harris 8th pdf contact lenses.

Aetna considers PTK experimental and investigational for the treatment of infectious keratitis and all other indications because it has not been shown to be safe and effective for these indications. Aetna’s standard HMO benefit plan excludes coverage of “radial keratotomy, including related procedures designed to surgically correct refractive errors”. Traditional benefit plans generally exclude coverage for services “for or related to any eye surgery mainly to correct refractive errors”. For plans that do not have a specific contractual exclusion of refractive surgery, refractive surgery is considered experimental and investigational or not medically necessary, as is outlined below. 00 diopters because this refractive error can be corrected satisfactorily with eyeglasses or contact lenses.

Radial keratotomy is considered investigational for treatment of myopia greater than -8. 00 diopters and all other refractive errors because its effectiveness for these indications has not been established. Astigmatic keratotomy is considered investigational for treatment of all other refractive errors because its effectiveness for these indications has not been established. 0 diopters, with or without astigmatism up to 5.

0 diopters, because this can be corrected satisfactorily with eyeglasses or contact lenses. 0 diopters with or without astigmatism up to 5 diopters. Keratophakia is considered investigational for correction of refractive errors because its effectiveness for the treatment of refractive errors has not been proven. It is considered investigational for pterygium and when performed solely to correct astigmatism and other refractive errors because its effectiveness for these indications has not been established.

Fuch’s dystrophy, corneal degeneration, other corneal dystrophies, corneal edema, and herpes simplex keratitis. Penetrating keratoplasty is considered investigational when performed solely to correct astigmatism or other refractive errors because its effectiveness for these indications has not been established. Tissue procurement, preservation, storage and transportation associated with medically necessary corneal transplantation are also considered medically necessary. 0 diopters and myopia of up to -10. 0 diopters, with or without astigmatism up to 4. 0 diopters, because the refractive corrections achieved with PRK and PARK are less precise than that achieved by eyeglasses or contact lenses. Where indicated for keratoconus or pellucid marginal degeneration, INTACS are not excluded from coverage under plans that exclude coverage of refractive surgery.

Fyodorov, are considered experimental and investigational for treatment of refractive errors, keratoconus, and all other indications because their effectiveness for these indications has not been established. Orthokeratology is considered investigational for correction of refractive errors and all other indications because its effectiveness for these indications has not been established. Scleral Expansion Surgery is considered experimental and investigational for presbyopia and all other indications because its effectiveness for these indications has not been established. 5 to -20 diopters with less than or equal to 2.