Before the laser iridotomy procedure, your doctor gives you drops that make the pupil small. The purpose is to expand the iris so that the doctor can find the best place in the pigment to aim the laser.
The contraction of the pupil may cause a mild headache, but it shouldn’t last long. However, if you have an ongoing headache, or worse, if you become nauseous, see halos, or have pain in the eye, your angle may have closed up again. A narrow angle is one cause of glaucoma.
The iridotomy is meant to open the angle to allow drainage, which keeps the pressure in the eye at a normal level.
If the angle closed up, you might need a second procedure. In a few cases, laser iridotomy doesn’t work with just one procedure. Your doctor should schedule a follow up to check your pressure.
Take this situation seriously. If your pressure is high for an extended period, you could lose your vision.