Flashcards on Contact Lens Fitting and Complications
Contact Lens Fitting & Complications: Student Guide
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Contact Lenses — Problems & Presbyopia
45 cards
Card 1
Question: What are the two main contact lens strategies for correcting presbyopia described here?
Answer: Simultaneous vision (multifocal/ aspheric designs) and monovision (one eye for distance, the other for near).
Card 2
Question: How is monovision typically achieved and what is a common supplemental option for critical vision tasks?
Answer: One eye fitted for distance and the other for near; for critical tasks a supplemental correction (a second distance contact lens or driving glasses) m
Card 3
Question: What initial test steps are listed for prescribing multifocal soft lenses like Proclear/Biofinity?
Answer: Subjective refraction including add power, determine eye dominancy, consider +2.00 in front of each eye for initial lens selection, account for vertex
Card 4
Question: In a 'straight binocular' multifocal approach what is preferable when fitting both eyes?
Answer: Fit full distance and full near prescription in both eyes (modified bifocal approach or simultaneous vision).
Card 5
Question: What modification is commonly made to the distance power of the non-dominant eye in modified bifocal/monovision strategies and why?
Answer: Add positive (+) power to the distance power of the non-dominant eye to improve near acuity.
Card 6
Question: What modification might be applied to the dominant eye and what is its purpose?
Answer: Add negative (−) power to the distance power of the dominant eye to improve distance acuity.
Card 7
Question: Describe the Air Optix Multifocal lens design features noted.
Answer: Aspheric design with near portion compacted (~4 mm), large peripheral distance zone, smooth transition zone, three add powers (Low, Med, Hi); base cur
Card 8
Question: What are common signs of GP lens anterior surface muco-protein film or haze and when does it occur?
Answer: Acquired muco-protein film or haze over the lens anterior surface causes reduced vision and occurs within weeks to a month of lens wear.
Card 9
Question: List causes of anterior lens muco-protein film formation on GP lenses.
Answer: Poor tear quality, improper blinking, inadequate compliance, and improper use of solutions.
Card 10
Question: What are the typical hydrogel lens causes of reduced vision described?
Answer: Lens deposits (muco-proteinaceous film and lipid-calcium complexes), corneal edema; symptoms may be foggy or hazy vision and may disappear when lenses