I read an article comparing traditional (GAT) vs. noncontact tonometry (Reichert PT 100). It showed that in the normal IOP range, the two were roughly identical. At higher IOP’s, the non-contact became less reliable. The article also stated that central corneal thickness (CCT) affects the Reichert more. So, it’s pretty useless to monitor glaucoma patients.

So, does that mean it’s useful for screening? I think not, as IOP is not that helpful in screening for glaucoma- a good third of glaucoma have IOP of 22 or less. I think most screenings today are, or should, be using FDT visual fields. It takes 5 minutes per eye, but it’s better than IOP checks. So, to be honest, I don’t see a big place for this instrument.

Anyway, here’s a link ^[1] to download the article in PDF format appearing in Clinical Ophthalmology (published by Dovepress).