25M Steroid Induced Pressure Spike to 45mmhg. Concerned About Glaucoma Risk.
A couple months ago I got diagnosed with Keratoconus, which for anyone unfamiliar is basically a condition of the eye where the cornea progressively thins and becomes distorted into a cone shape. I ended up getting a procedure called corneal cross-linking done in both eyes, which is meant to stop or slow the progression, and everything looks good so far.
Part of the post-op recovery was being put on dexamethasone steroid drops 4x a day for a month, with no taper. I finished the course for my left eye about a month ago and the pressure there only went up to 18 mmHg, so nothing concerning. My right eye was supposed to finish this Friday, so I'd been on the drops for just under a month.
Over the last week or so I started getting this feeling that the peripheral vision in my right eye maybe wasn't as good. Hard to explain exactly, but enough that I trusted my instincts and booked an appointment with my ophthalmologist, who also specialises in glaucoma.
They did a Humphrey visual field test and it actually came back reassuring. My right eye, which was the eye I was worried about, scored 99% VFI. Left eye was 90%, though they think the lower score was mostly just from the Keratoconus itself since that eye is much worse overall at 20/200.
Then they checked my pressure and my right eye was at 45 mmHg. Yeah...
They repeated the test twice just to confirm it, and were a bit surprised by how high it was, especially since I’d only really had vague, subjective symptoms and nothing that clearly matched a pressure spike that large. What's really confused me is that I genuinely don't think I overused the drops at all, and it seems crazy to me that one eye barely responded while the other shot up that high.
They stopped the dexamethasone immediately and started me on Azarga, which is a combination drop of brinzolamide and timolol, twice a day, morning and evening roughly 12 hours apart. I've got another consult in a week.
I guess my concern is just whether, with pressure that high even if it's been for a relatively short period, if there's any realistic scenario where very early glaucoma damage could occur that wouldn't necessarily show up yet on a visual field test. The ophthalmologist, said they’d be much more concerned if it had been 2 to 3 months at that pressure level, and overall they seemed fairly reassured given that it was a month at most, but I'm still trying to make sense of how worried I should actually be.