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  2. Photorefractive keratectomy - Wikipedia

    en.wikipedia.org/wiki/Photorefractive_keratectomy

    Patients that wear contact lenses will typically need to stop wearing these for a specified time before the procedure. [5] PRK disadvantages include a longer recovery time for vision in contrast to LASIK which may be between five days and two weeks for blurred vision to properly clear.

  3. LASIK - Wikipedia

    en.wikipedia.org/wiki/LASIK

    A small percentage of patients may need further surgery because their condition is over- or under-corrected. Some patients need to wear contact lenses or glasses even after treatment. [45] The most common reason for dissatisfaction in LASIK patients is chronic severe dry eye. Independent research indicates 95% of patients experience dry eye in ...

  4. Effects of long-term contact lens wear on the cornea - Wikipedia

    en.wikipedia.org/wiki/Effects_of_long-term...

    Long-term contact lens use can lead to alterations in corneal thickness, stromal thickness, curvature, corneal sensitivity, cell density, and epithelial oxygen uptake. . Other structural changes may include the formation of epithelial vacuoles and microcysts (containing cellular debris), corneal neovascularization, as well as the emergence of polymegethism in the corneal endoth

  5. Orthokeratology - Wikipedia

    en.wikipedia.org/wiki/Orthokeratology

    Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

  6. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    A pair of contact lenses, positioned with the concave side facing upward A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception . The most common use is to treat refractive errors : myopia , hypermetropia , astigmatism , and presbyopia .

  7. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Artist's impression of Leonardo's method for neutralizing the refractive power of the cornea. Leonardo da Vinci is frequently credited with introducing the idea of contact lenses in his 1508 Codex of the eye, Manual D, [9] wherein he described a method of directly altering corneal power by either submerging the head in a bowl of water or wearing a water-filled glass hemisphere over the eye.