What is the purpose of measuring the intraocular pressure with an applanation tonometer?

To diagnose glaucoma.
To identify patients at increased risk of developing glaucoma.
To correct vision problems.
To measure the thickness of the cornea.
a) I and III are correct.
b) II and IV are correct.
c) Only II is correct.
d) Only III is correct.
e) Only II and III are correct.