The purpose of the study is to investigate the IOP difference between normal and glaucomatous eyes using standard ophthalmic tonometry devices while subjects are performing different standard yoga asanas. The IOP of participants will be measured prior, immediately at start of the asana, 2 minutes into the asana, and immediately after assuming a sitting position. The patient will wait 10 minutes and a final IOP will be taken. Four standard yoga asanas will be tested.