Universal Patient Response Button - compatible with Zeiss Humphrey visual fields Clicker Brand_Welch Allyn A non-contact optical device that

A non-contact optical device that measures the distance from the corneal vertex to the retinal pigment epithelium by partial coherence interferometry

Even with staphyloma

The KR-8000 enables precise measurements of corneal

and faster

Control of cylinder axis and power testing is amazingly simple

Universal Patient Response Button - compatible with Zeiss Humphrey visual fields Clicker Brand_Welch Allyn A non-contact optical device thatThis is a universal patient response button, also called "the clicker", which can be used for visual field units. Please check the plug in the photo compared to your unit. This is NOT compatible with the FDT and Matrix units. Please see our other listing for the correct plug. Compatible with Zeiss Humphrey 720, 720i, 730, 735, 740, 740i, 745, 745i, 750, 750i