Keeler D-KAT - Tonometer Prism Field Check; Prism Integrity Check

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5. Tonometer Prism field check
Check the Tonometer prism under the Slit lamp and ensure there
are no cracks / chips. the chemical used in the diagnosis process
(for example: Fluorescein) will get into the cracks and will show
up if observed under the slit lamp. Do not use it if there is any
sign of cracks / chips.