Goldmann applanation tonometry estimates intraocular pressure from the force needed to flatten a standardised area of cornea. Why is that particular flattened area used? A At that area, the cornea no longer refracts any light from the slit beam B At that area, corneal rigidity and tear-film surface tension cancel out C At that area, the reading can be taken without any topical anesthetic D At that area, the fluorescein ring is too small to touch the lid margin
Practice questions based on the IJCAHPO core certification content areas for the Certified Ophthalmic Assistant and on standard ophthalmic clinical practice references. COA, COT, and COMT are marks of the International Joint Commission on Allied Health Personnel in Ophthalmology; this site is not affiliated with or endorsed by IJCAHPO. Ophthalmic assistants work under the delegation of a supervising ophthalmologist and permitted tasks vary by state and by practice — confirm your own scope, and check the current exam requirements and content outline with IJCAHPO before testing.
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