Vision and Ophthalmology Surgical Procedures and Treatments 2

Question 1

Selective laser trabeculoplasty (SLT) reduces IOP by:

Accepted Answer

Selectively targeting pigmented trabecular cells to improve outflow

Answer

SLT uses a 532 nm frequency-doubled Nd:YAG laser to selectively target melanin-containing trabecular cells, triggering a biological response that improves aqueous outflow without coagulative damage.

Question 2

A scleral buckle procedure treats rhegmatogenous retinal detachment by:

Accepted Answer

Indenting the sclera to bring the choroid closer to the detached retina

Answer

Scleral buckling places a silicone band or sponge around the eye to indent the scleral wall, relieving vitreoretinal traction and approximating the retina to the RPE.

Question 3

Photodynamic therapy (PDT) with verteporfin is used for which condition?

Accepted Answer

Predominantly classic CNV in wet AMD

Answer

PDT involves IV verteporfin (photosensitizer) that accumulates in CNV; activation with 689 nm laser causes selective thrombosis of the abnormal vessels.

Question 4

Corneal transplantation (DSAEK/DMEK) selectively replaces which layer of the cornea?

Accepted Answer

Endothelium and Descemet's membrane

Answer

DSAEK (Descemet's Stripping Automated Endothelial Keratoplasty) and DMEK replace only the diseased endothelium and Descemet's membrane, preserving the recipient's stroma.

Question 5

Botulinum toxin injection for strabismus works by:

Accepted Answer

Temporarily paralyzing the overacting muscle, allowing the antagonist to stretch it

Answer

Botulinum toxin (Botox) injected into an overacting extraocular muscle temporarily paralyzes it, allowing the antagonist to pull the eye toward alignment during the paralysis period.

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Practice Test

Vision and Ophthalmology Surgical Procedures and Treatments 2