CSO T Type Applanation Tonometer (F900)

The F900 and A900 applanation tonometers are accessories for the SL990 slit lamp to measure ocular pressure. Due to its versatile design, they can also be combined with other manufacturers equipment. The tonometers operate using the Goldmann method, meaning that it measures the pressure required for maintaining uniform applanation of the corneal surface. Precise measurement of the small flattened surface is completed using a slit lamp at 10x magnification.

Also known as the F900.

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Further Information

Advantages:

Measurement of the patients endocular pressure is made using a slit lamp, along with other routine microscopic measurements
High measurement accuracy, the standard deviation amongst single measurements is approx +- 0,5mmHg
The value is displayed in mmHg directly on the instrument
Scleral rigidity consideration is not required as the small volume moved (0,56 mm3) increases intra-ocular pressure by only 2,5% (approx)
Measurement repetition does not reduce ocular pressure as there is no ‘massage effect’ to report
Simple calibration and standardization

The F900 must be placed on the guide plate in one of two possible position, right or left eye. These positions are related to the microscope, and observation can be made through either eyepiece. The doubling prism, which is held in a ring at the end of the pressure arm is automatically in the path of the microscope and illumination beam. To obtain as clear an image as possible, the angle between illumination and microscope should be about 60 degrees and the slit diaphragm should be completely open.

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CSO Tonometers Brochure2.09 MB