Ocular Anatomy and Conditions Questions and Answers Flashcards
6 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Ocular Anatomy and Conditions Questions and Answers flashcards as text
Keratoconus is characterized by:
Answer: Progressive corneal thinning and ectasia causing an irregular cone-shaped cornea with high myopia and irregular astigmatism
Keratoconus is a non-inflammatory progressive ectatic disorder where the cornea thins and protrudes in a cone shape, inducing irregular astigmatism and high myopia.
A patient presents with sudden onset of halos around lights, eye pain, nausea, and blurred vision. This presentation is most consistent with:
Answer: Acute angle-closure glaucoma
Acute angle-closure glaucoma presents with sudden severe eye pain, halos, nausea/vomiting, and rapidly increasing IOP. This is an ocular emergency requiring immediate referral.
Which type of cataract forms in the central part of the crystalline lens and is associated with excessive UV light exposure and aging?
Answer: Nuclear sclerotic cataract
Nuclear sclerotic cataracts form in the nucleus of the crystalline lens, associated with aging and UV exposure. They cause myopic shift ('second sight') and yellowing of the lens.
Which refractive error is caused by the cornea or lens having different curvatures in different meridians?
Answer: Astigmatism
Astigmatism occurs when the eye's refracting surfaces (usually the cornea) have different powers in different meridians, causing light to focus in two separate focal lines instead of a single point.
Diplopia (double vision) presenting in a patient wearing their current glasses is most appropriately addressed by the optician by:
Answer: Verifying the glasses with a lensometer and checking alignment, then referring to the prescriber if glasses are within tolerance
The optician should first verify the glasses are correct. If within tolerance, diplopia is a clinical finding requiring referral to the prescriber for evaluation of a possible binocular vision or neurological problem.
Presbyopia is best defined as:
Answer: Age-related loss of accommodative amplitude due to decreased crystalline lens elasticity
Presbyopia is the age-related reduction in accommodation caused by the crystalline lens losing its elasticity, typically becoming noticeable after age 40.