Digital Contact Tonometers

D-KATDiscover the new standard ... Keeler D-KAT Digital Applanation Tonometers


New to the Keeler product portfolio is the Digital Applanation Tonometer, (D-KAT). 

Designed and manufactured in the UK to the same exacting standards as all Keeler products, the Keeler D-KAT delivers reliability and ease of use. 

With its LED display and internal electronics it allows for the fast accurate measurement of IOP, (intraocular pressure). Now available in Ziess Type and both R & T Type variants. The R type can be fixed to the slitlamp. The T type is removable and is convenient to use on multiple slit lamps.

With less moving parts, the D-KAT is more reliable, accurate and recalibration takes just seconds.



  • British built
  • Available in both fixed and takeaway variants
  • LED display for ease of use in darkened environments
  • Lightweight and portable
  • Display reading to 1 decimal point
  • Low battery usage
  • Less moving parts, meaning increased reliability and less maintenance

Keeler – British manufacturing experience delivering innovation and quality for the digital generation

The Keeler Digital Applanation Tonometer (D-KAT) is an instrument intended for measuring intraocular pressure to aid in the screening and diagnosis of glaucoma.

It operates according to the 'Goldmann method', by measuring intraocular pressure from the force required to flatten (applanate) a constant area (3.06mm) of the cornea.

The D-KAT is an accessory for the 'tower illumination' style of Slit lamp.

Whether you chose a Z-Type, T-Type or R-Type version, your Keeler D-KAT will come with all the items you need.

Each unit contains a calibration arm and a re-usable tonometer cone. You will also receive a guide plate or connection post depending on your choice of D-KAT.


Exceptional Optics

Market leaders

Keeler is renowned for market-leading optics and has been dedicated to optical design and manufacture for nearly 100 years.

Customer confidence

Our customers have absolute confidence in the quality, accuracy and reliability delivered by our optical designs.

Advanced manufacturing

Our advanced design and manufacturing techniques give Keeler instruments outstanding performance.

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