1. Have only one functional eye

2. Have difficulty in ocular fixation or eccentric fixation in either eye

3. Have corneal scar or have a history of corneal surgery such as corneal laser surgery (cataract surgery is acceptable)

4. Have microphthalmia

5. Have buphthalmos

6. Wear contact lens (have used soft contact lenses within the last 3 months and/or hard contact lenses within the last 6 months)

7. Have dry eyes and taking prescription medication or using artificial tears daily

8. Have blepharospasm

9. Have nystagmus

10. Have keratoconus

11. Have corneal or conjunctival lesions or infections

12. Have a central corneal thickness of \<500μm or \>600μm

13. Have corneal astigmatism \>3D

14. Have known allergy to ophthalmic anesthetics

15. Have known allergy to sodium fluorescein

TRK-3 Conformance to Standards for Tonometers