Cochet-Bonnet esthesiometry
Eye Care
estimated about CNY 150-300
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Description
A clinical test measuring corneal sensation using a calibrated nylon filament to assess trigeminal nerve (V1) function and detect neurotrophic keratopathy or other sensory deficits.
Main Uses
Assessing trigeminal nerve (ophthalmic division, V1) function; diagnosing neurotrophic keratopathy; evaluating risk of corneal epithelial breakdown pre- and post-refractive surgery (e.g., LASIK, SMILE); monitoring progression in systemic neuropathies (e.g., diabetes, sarcoidosis); guiding management of persistent corneal ulcers or recurrent erosions.
Normal Range
Normal corneal sensation is typically 40–60 mm filament length (measured using Cochet-Bonnet esthesiometer), corresponding to a pressure threshold of approximately 0.8–2.0 g/mm²; values ≥45 mm generally indicate intact trigeminal (V1) innervation and normal protective reflexes.
Low Values - Possible Causes
Trigeminal neuropathy (e.g., herpes zoster ophthalmicus), diabetic peripheral neuropathy, leprosy (Hansen’s disease), post-surgical nerve damage (e.g., after refractive or cataract surgery), chronic dry eye with neurotrophic keratopathy.
High Values - Possible Causes
True 'high' corneal sensation is not clinically meaningful or measurable with Cochet-Bonnet esthesiometer; apparent hyperesthesia is usually artifactual (e.g., patient anxiety, eyelid spasm, examiner technique error, or misinterpretation of response); no validated pathological condition causes objectively increased corneal sensation — thus 'high values' are not recognized as a true abnormality and reflect test limitation or false-positive response.
estimated about CNY 150-300
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