Correct Refractive Surgery for Thin Cornea
When a patient with an eye condition is looking for correct refractive surgery like LASIK for eye corrective other than spectacles, there are some criteria that the patient should fall under. one of these criteria is corneal thickness. There should be enough corneal tissue available to make a flap. If the cornea is not thick enough to make a layer of at least 300 microns under the flap then LASIK is not the best refractive correction for the patient.
Why corneal thickness is important?
The cornea is the outer front of the eye. An average cornea thickness ranges from 540-560 microns. You will need at least 485 microns thick corneal tissue to be eligible for the LASIK surgery. 12 to 14 microns are removed per diopter unit for vision correction. For example, if you have -2D refractive error, 24 to 26 microns corneal tissue will be removed.
In LASIK, corneal irregularities are treated by fixing the corneal tissue. The surgeon will cut a flap in the epithelial layer of the cornea and remove/fix some tissue, then put the flap back to heal. Numerous eye conditions like Farsighted, Nearsighted, and Astigmatism are corrected.
Some people are born with a thin cornea. Whereas in some people factors like excessive eye rubbing, dry eyes or eye allergy can cause corneal thinning. A patient with a thin cornea can choose other alternatives for correct refractive surgeries such as PRK, phakic IOL implantation. in these correct refractive surgeries a flap incision is not required. therefore, a person with thin cornea may be well suited for these surgeries.
Correct refractive surgeries for thin cornea
LASIK is one of the best eye corrective surgery out there. However, not everyone is well suited for it. Along with thin corneal eyes, LASIK also can not be performed on a person with a strong eye power prescription, because too much corneal tissue will be removed in the surgical procedure for the correction. The good news is various other alternative eye corrective surgeries are available.
- PRK Correct Refractive Surgery
During Photorefractive Keratotomy, PRK, the surgeon will remove the topmost layer of the cornea. The topmost layer called the epithelium is removed using an alcohol solution, to expose the stroma. The ophthalmologist then reshapes your cornea using a laser to ensure a spectacle-free vision. There is no flap raised, and only the epithelium is removed, which grows back over three to four days. After the procedure, the surgeon inserts a bandage contact lens to protect the cornea until the epithelial layer grows back. The thick contact lens also helps decrease the discomfort during this time, which has been variably described from being mild to moderate, along with the sensation of having “something,” or a foreign body, in the eye.
ASA correct refractive surgery
ASA / Advanced Surface Ablations collectively refers to a group of surgeries including LASEK (in which a trephine removes the epithelial flap, which is replaced at the end of surgery), Epi LASEK (which uses a particular microkeratome, the Epi-keratome to remove the epithelial flap, which is replaced at the end of surgery) and Supra LASIK or touch-less LASIK (which is a surface laser procedure that manages a technologically advanced excimer laser to remove the surface cells before performing the reshaping of the cornea).
The Disadvantages of the surface ablations, including Supra LASIK, are:
- Discomfort for the first two or three days following treatment, till the epithelium grows back.
- Vision recovery takes longer as compared to LASIK.
- Small risk of corneal haze since the epithelium is removed during the procedure.
The Obvious Advantage of ASAs is that they are useful for patients who have had a cornea transplant before. However, the potential advantage that they are deemed to offer to people with thinner corneas is now being challenged.
LASIK technology grows more advanced and customized to the needs of the individual cornea. Thus surgeons prefer to offer one of the newer variants of LASIK, even to patients with thinner corneas.
Lens Replacement Surgery
Another correct refractive surgery for people with the thin cornea is lens replacement surgery also known as refractive lens exchange. In this surgery procedure, a natural lens with refractive error is replaced with an artificial intraocular lens (IOL). lens replacement surgery is similar to cataract surgery, as IOL is also placed in a place of the natural lens in cataract surgery.
Lens replacement surgery suits better to farsighted eyes. Nearsighted patients can find better results with other corrective surgeries.
Phakic Intraocular Lenses
Phakic intraocular lenses commonly called ‘implantable lenses’ are also a great substitute for those with thin cornea. In this procedure of correct refractive surgery, implant lenses are placed between the iris and cornea, also the natural lens remains intact in this process. Phakic IOL is like contact lenses that are permanently settled in your eyes. people with myopia should find these lenses suitable.
The shape of the cornea is changed during LASIK surgery, influencing one’s vision. Therefore, it is important to choose the surgery procedure wisely to keep your vision and eyes well. Above mentioned surgeries are a good substitute for LASIK to correct the refractive error. Still to know the best suitable type of surgery get your eyes examined by an eye doctor ask for suggestions.
If you are also looking for Correct Refractive Surgery in Thin Corneas, visit EyeMantra today.
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