CO Optical Devices & Low Vision Rehabilitation Flashcards
6 cards from real CO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CO Optical Devices & Low Vision Rehabilitation flashcards as text
Low vision is generally defined as best-corrected visual acuity of:
Answer: 20/70 or worse in the better eye
Low vision is defined as best-corrected visual acuity of 20/70 or worse in the better eye that cannot be improved with standard optical correction.
Fresnel press-on prisms incorporated into a spectacle lens are primarily used to manage:
Answer: Diplopia caused by strabismus
Fresnel press-on prisms are used to neutralize diplopia by redirecting the visual axis in patients with strabismus, especially when deviation may change over time.
Which low vision device uses a strong convex lens resting on reading material to magnify near objects?
Answer: Stand magnifier
Stand magnifiers use a strong convex lens mounted at a fixed focal distance and rest directly on reading material to provide stable near magnification.
When prescribing base-out prism for a patient with esotropia and diplopia, the prism functions by:
Answer: Redirecting the visual axis nasally to align the diplopic images
Base-out prism redirects the visual axis nasally, compensating for esotropia and aligning the diplopic images to eliminate double vision.
Bioptic telescopes are primarily prescribed to:
Answer: Allow patients with low vision to meet driving visual acuity requirements
Bioptic telescopes are miniature telescopes mounted superiorly in spectacle lenses that allow patients with low vision to spot-check acuity for driving in states that permit bioptic driving.
According to Prentice's Rule, the prismatic effect in prism diopters equals:
Answer: Lens power in diopters multiplied by decentration in centimeters
Prentice's Rule states that prismatic effect (Δ) = lens power (D) × decentration (cm), essential for calculating induced prism from decentered lenses.