Influence of corneal status, thickness and tear film on the intraocular pressure (IOP) value measured with the Goldmann Applanation Tonometry.
| Direct | Koeppe (contact fluid required) |
| Layden (sized for infants; contact fluid required) | |
| Worst | |
| Indirect | Posner or Zeiss or Sussman 4 mirror (contact fluid not required) |
| Goldmann lens, 1 to 4 mirrors (contact fluid required) | |
| CGA 1.4© Lasag (contact fluid required) | |
| Magnaview (contact fluid required) |