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Why is there a difference in residual stromal bed for PRK and LASIK?

LijahMay 26, 2014
I have recently been considering eye surgery to correct my myopia. My glasses prescription is -6.5 with -0.5 astigmatism in both eyes. My corneal thickness is about 494 in one eye and 516 in the other. I'm pretty sure LASIK is out of the question but just wondering about PRK? I've read that the ideal residual stromal bed for LASIK is 250 whereas for PRK it's 400. This seems like a huge difference and I was just wondering why this is?

Answers (1)

From board-certified doctors and trusted medical professionals
Dr. Michael K. Tracy, MD
Board Certified Ophthalmologist
Answered on Jun 13, 2014
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Richard A. Norden, MD (in memoriam)

Having an MRI after PRK is absolutely no problem, even shortly after PRK or LASIK. Magnetic alignment of electrons as is done in an MRI does not influence epithelial healing nor flap healing.

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Arthur Benjamin, MD

Management of dry eye after refractive surgery may require a multi-pronged approach. Non preserved artificial tears may need to be used as often as every 1-2 hours. Restasis, a prescription medication, may be required to improve the quality of the tears produced.Punctal, collagen or...

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Michael K. Tracy, MD

Dry eyes almost always resolve six months to a year after PRK. If your dry eyes persist you may have other risk factors such as allergies, ocular rosacea or floppy eyelid syndrome. This could also be the cause of your eye pain. The two eyes are usually very similar in vision after 15 months. ...

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