مهندسی پزشکی

techniques. The goal of refractive surgery is to avoid permanently weakening the cornea with incisions and to deliver less energy to the surrounding tissues.

Experimental techniques

• "plain" LASIK: LASEK, Epi-LASIK,
• Sub-Bowman’s keratomileusis (thin flap LASIK),
• Wavefront-guided PRK,
• advanced intraocular lenses.
• Femtosecond laser intrastromal vision correction: using all-femtosecond correction, for example, Femtosecond Lenticule EXtraction, FLIVC, or IntraCOR),
• Keraflex: a thermobiochemical solution which has received the CE Mark for refractive correction.^[81] and is in European clinical trials for the correction of myopia and keratoconus.^[82]
• Technolas FEMTEC laser: for incisionless IntraCOR ablation for presbyopia,^[83] with trials ongoing for myopia and other conditions.^[84]
• LASIK with the IntraLase femtosecond laser: early trials comparing to the «LASIK with microkeratomes for the correction of myopia suggest no significant differences in safety or efficacy. However, the femtosecond laser has a potential advantage in predictability, although this finding was not significant».^[85]

Comparison to photorefractive keratectomy

A systematic review that compared PRK and LASIK concluded that LASIK has shorter recovery time and less pain.^[86] The two techniques after a period of one year have similar results.^[86]

A 2017 systematic review found uncertainty in visual acuity, but found that in one study, those receiving PRK were less likely to achieve a refractive error, and were less likely to have an over-correction than compared to LASIK.^[