How does ocular response analyser works

The Ocular Response Analyzer (ORA) is the only instrument in the world capable of measuring Corneal Hysteresis (CH); an indication of the biomechanical properties of the cornea. This information is different from thickness or topography, which are geometrical attributes of the cornea. CH represents a tissue property, which provides more comprehensive information about ocular biomechanics. The CH measurement provides independent information that aids in the diagnosis and management of glaucoma.

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I got problem by running ORA, no act when turn on device i changed fuses but I couldn't to resolve my problem yet?! anyone can help me,