Contact Lens Fitting and Dispensing Flashcards
7 cards from real NOCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Contact Lens Fitting and Dispensing flashcards as text
When fitting a patient for monovision contact lenses, which eye is conventionally corrected for distance vision?
Answer: The dominant eye
In monovision fitting, the dominant eye is corrected for distance vision because it is the eye relied upon for critical distance tasks such as driving.
Which multifocal contact lens design features alternating concentric rings of distance and near powers?
Answer: Concentric (annular) simultaneous vision design
Concentric (annular) simultaneous vision designs have distinct rings of distance and near power arranged concentrically, requiring the visual system to selectively use the appropriate zone.
What is the recommended replacement schedule for daily disposable contact lenses?
Answer: Discard after each single use
Daily disposable lenses are designed to be worn once and discarded at the end of the day, providing a fresh sterile lens with each use and minimizing deposit accumulation.
Which contact lens care concern has been associated with certain multipurpose solutions and silicone hydrogel lens materials?
Answer: Decreased surface wettability due to preservative interaction
Certain preservatives (such as PHMB) in some multipurpose solutions can interact with silicone hydrogel lens surfaces, leading to decreased wettability and increased discomfort.
When instructing a new contact lens wearer on lens insertion, what is the correct sequence of steps?
Answer: Wash hands, verify lens orientation, then insert lens
Proper hand washing must occur before any lens handling to minimize infection risk, followed by verifying lens orientation to ensure correct power placement before insertion.
A patient wearing extended wear contact lenses presents with a red, painful eye and photophobia. What is the MOST critical first step?
Answer: Remove the lens immediately and refer for urgent medical evaluation
Red, painful eye with photophobia in a contact lens wearer are signs of potential microbial keratitis, a sight-threatening emergency requiring immediate lens removal and urgent ophthalmic evaluation.
What does the 'push-up test' evaluate during a soft contact lens fitting?
Answer: The movement and tightness (mobility) of the soft lens on the eye
The push-up test involves using the lower lid to push the lens superiorly and observing how easily it moves and recenters, assessing whether the lens fit is too tight or too loose.