Ocular Prosthetics Flashcards
7 cards from real CCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ocular Prosthetics flashcards as text
Which type of orbital implant allows for the best prosthetic motility by permitting direct fibrovascular ingrowth?
Answer: Porous polyethylene (Medpor) or hydroxyapatite implant
Porous implants such as hydroxyapatite and porous polyethylene allow fibrovascular ingrowth, enabling pegging for superior prosthetic motility.
What is the correct technique for assessing superior fornix depth when evaluating an ocular prosthesis fit?
Answer: Using a graduated conformer or placing the prosthesis and evaluating upper lid elevation and retention
Clinical evaluation with the prosthesis in place — observing lid elevation, retention, and upper lid fullness — is used to assess adequate superior fornix support.
A patient with a contracted socket has difficulty retaining an ocular prosthesis. Which surgical procedure most directly addresses socket volume and fornix depth?
Answer: Mucous membrane grafting with fornix reconstruction
Mucous membrane grafting combined with fornix reconstruction deepens the conjunctival fornices, restoring volume and retention for an ocular prosthesis.
What is the function of the 'wax try-in' stage in custom ocular prosthesis fabrication?
Answer: To evaluate size, projection, iris position, and eyelid contour before committing to acrylic
The wax try-in allows the anaplastologist to verify and adjust prosthesis dimensions, iris placement, and eyelid support before final acrylic processing.
Which condition is characterized by the absence of an eye from birth due to complete failure of the optic vesicle to develop?
Answer: Anophthalmia
Anophthalmia is the congenital absence of ocular tissue resulting from failure of the optic vesicle to form during embryonic development.
When polishing a finished acrylic ocular prosthesis, which sequence of abrasives is correct?
Answer: High-grit wet sandpaper → coarse pumice → fine pumice → high-shine polish
The correct polishing sequence progresses from coarser wet sanding through progressively finer pumice compounds to a final high-shine polish for a smooth, biocompatible surface.
In the CCA examination context, what is the primary distinction between evisceration and enucleation?
Answer: Enucleation removes the entire eyeball while evisceration removes intraocular contents leaving the scleral shell
Enucleation removes the entire globe, while evisceration removes only the intraocular contents leaving the scleral shell in place, which can affect implant and prosthesis planning.