What are the Requirements to be Eligible for SMILE LASIK?

What are the Requirements to be Eligible for SMILE LASIK?


SMILE LASIK offers a broader range of eligibility compared to other vision correction surgeries. However, there are certain cases where SMILE LASIK may not be suitable. For example, if the cornea is too thin to undergo even LASIK or LASEK, then SMILE LASIK would not be possible either.


Is SMILE LASIK Possible on Eyes that have Already Undergone Surgery?



Since SMILE LASIK is also a laser-based vision correction surgery, it is generally difficult to perform it as a secondary correction on eyes that have already undergone previous laser surgery. Aside from that, there are certain mechanical limitations to the procedure.


For example, while SMILE LASIK can correct myopia and astigmatism, it cannot correct hyperopia regardless of the degree. This is because SMILE is not designed to reshape the cornea in a way that addresses hyperopia.


Even for myopia and astigmatism, there are diopter limits. For  myopia over -10.00 diopters cannot be corrected with SMILE LASIK. Also, astigmatism over 5.00 diopters is also beyond the correction range.


Therefore, eligibility for SMILE LASIK depends on your previous surgical history and current prescription.


What does Diopter Mean?



A diopter refers to the degree of myopia, hyperopia, or astigmatism. In SMILE LASIK, a laser penetrates the cornea to remove a small, lens-shaped piece of tissue called a lenticule from within the cornea. If the correction required (in diopters) is too low, the volume of tissue that needs to be removed is too small, which may not be suitable for the procedure.


To explain more simply: if the cornea is too thin for LASIK or LASEK, it is also likely unsuitable for SMILE LASIK. Additionally, SMILE is not ideal for correcting hyperopia, for patients with corneal opacities, or those with other corneal diseases. In such cases, or when presbyopia and hyperopia are involved, traditional procedures like LASIK are generally more appropriate.



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