Tonometry, illustration. This technique is used to measure the internal pressure in the eyeball (the intraocular pressure). The eyeball is shown at bottom centre. This is one of the tests for glaucoma, a build-up of pressure inside the eye causing blurring and blindness. Normal eye pressure ranges from 12-22 millimetres of mercury (mm Hg), and eye pressure of greater than 22 mm Hg is considered higher than normal. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / De Angelis, Maurizio |
Bildgröße: | 4000 px × 2194 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |