Quick Answer: How does LASIK affect IOP?

Does LASIK increase IOP?

During the LASIK procedure, there is a brief increase in IOP during the flap creation process. While this is not a concern for those with normal eye pressures, this can be cause for concern in glaucoma patients.

What is the effect of laser refractive surgery on IOP measurement?

found that patients undergoing LASIK treatment showed lower IOP after refractive surgery when measured with GAT but not when measured with DCT, which is apparently independent of CCT. Moreover, Shousha et al. concluded that IOP lowered after LASIK treatment when measured with both GAT and noncontact tonometer.

Does corneal refractive surgery affect IOP?

While the procedures themselves may cause a change in intraocular pressure, as with Steroid Glaucoma after LASIK or interface fluid, in most cases the true IOP remains the same and only the measurement is affected.

How is IOP measured after LASIK?

After LASIK, the biomechanical bending strength of the cornea is reduced by the cut so that the measured IOP must be additionally corrected by 0.75 mmHg. An equation containing all three changes is given: IOP (real) = IOP (measured) + (540-CCT)/71 + (43-K-value)/2.7 + 0.75 mmHg.

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Is LASIK bad for glaucoma?

“Since LASIK is not a surgery inside the eye, it does not affect the optic nerve, and it does not increase nor decrease your baseline risk for developing glaucoma,” says Dr. Yuna Rapoport, a board-certified ophthalmologist.

Does LASIK increase risk of retinal detachment?

This, in turn, makes the retina more fragile and prone to develop retinal detachment. The question is whether having LASIK further increases the risk of retinal detachment. The answer, at least according to an important new study, appears to be that LASIK does not increase the risk of retinal detachment.

When do you check IOP after PRK?

We suggest measuring IOP in post-PRK patients no later than 2 weeks after initiation of corticosteroid treatment.

What is dynamic contour tonometry?

The dynamic contour tonometer (DCT; Pascal tonometer) is a novel tonometer designed to measure intraocular pressure (IOP) independent of corneal properties.

Does PRK increase risk of glaucoma?

Following refractive surgery, a number of glaucoma-related problems can arise: After PRK, watch for steroid-induced glaucoma. The biggest glaucoma-related issue in the post-operative period is associated with the use of steroids, primarily following PRK.

How does steroid cause glaucoma?

Steroid-induced glaucoma is considered to be a type of secondary open-angle glaucoma, caused by increased resistance to the outflow of aqueous at the level of the trabecular meshwork. In this condition, there is increased production and decreased destruction of the extracellular matrix of the trabecular meshwork.

How do you calculate real IOP?

The formula is as follows: True IOP = Goldmann applanationIOP ÷ K, where K is a complex CF dependent on applanted area, radiusof curvature of the anterior cornea, center thickness of the cornea, and Poisson’sratio of the cornea.

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