tonometry

Indication: - evaluation of increased intraocular pressure Procedure: - measures the intraocular pressure of the eye by determining the amount of pressure needed to depress the cornea Methods: 1) Contact tonometry a) Schiotz tonometer - hand-held device easy to use - accuracy affected by: - improper placement - eyelid closure - sterilization between patients required to prevent transmission of disease (i.e. HIV etc.) b) Goldmann's applanation tonometer - most frequently used tonometer - attached to slit lamp - requires use of topical anesthetic 2) Non-contact tonometry - measures pressure using jet of air to depress globe - pressure recorded by pneumotonometer - good for screening large numbers of patients - may require several measurements for accurate reading

Specific

Goldman applanation tonometry (GAT Tapp, Ta) intraocular pressure (IOP) by applanation tonometry (Ta) intraocular pressure (IOP) by pneumatonometer (Tp) intraocular pressure (IOP) by Shiotz tonometry (Ts) intraocular pressure (IOP) by TonoPen (Tpen)

References

Saunders Manual of Medical Practice, Rakel (ed), WB Saunders, Philadelphia, 1996, pg 66-67