Prior to performing a keratorefractive procedure it is advisable to have pre-treatment refraction and keratometry (K and method) registered. 3rd generation formulae with Aramberri's double-K correction, or 4th generation formulae are recommended.
The maximum performance of a test is reached when it is used in a maximum uncertainty situation (disease probability 50%). Its highest usefulness is obtained when pre-test probability is maximal, after a careful review of the patient's history and a complete patient examination.
The main modality of treatment for CCSF is intervention radiology. This aims to occlude the fistula via an arterial route, through the cavernous sinus, or via a venous route, through the inferior petrosus sinus. However, the CCSF is also accessible through the SOV.
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