Cataract and Lens Flashcards
7 cards from real ABO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Cataract and Lens flashcards as text
Per the Endophthalmitis Vitrectomy Study, which patients with acute post-cataract endophthalmitis benefit from immediate pars plana vitrectomy rather than tap and inject?
Answer: Patients with light perception only vision
The EVS showed immediate vitrectomy was beneficial only for patients presenting with light perception vision; others did equally well with tap and inject.
What is the most common causative organism in acute postoperative endophthalmitis after cataract surgery?
Answer: Coagulase-negative staphylococci
Coagulase-negative staphylococci, mainly Staphylococcus epidermidis from the eyelid flora, account for most culture-positive cases in the EVS.
Twelve hours after uneventful cataract surgery, a patient has diffuse limbus-to-limbus corneal edema, marked anterior chamber reaction, and minimal pain. Cultures are negative. What is the most likely diagnosis?
Answer: Toxic anterior segment syndrome
TASS is a sterile inflammatory reaction occurring within 12-48 hours, typically with diffuse corneal edema and treated with intensive topical steroids.
Pseudophakic cystoid macular edema (Irvine-Gass syndrome) most commonly reaches peak incidence at what time after surgery?
Answer: 4-12 weeks
Clinically significant pseudophakic CME typically peaks around 4-12 weeks after cataract surgery.
A patient with a single-piece acrylic IOL placed in the sulcus develops recurrent hyphema, elevated IOP, and iris transillumination defects. What is the diagnosis?
Answer: Uveitis-glaucoma-hyphema syndrome
UGH syndrome results from IOL chafing of the iris or ciliary body, classically with single-piece acrylic lenses placed in the sulcus.
What is the most common complication following Nd:YAG laser posterior capsulotomy?
Answer: Transient intraocular pressure elevation
A transient IOP spike is the most common complication after YAG capsulotomy, so pressure is checked and prophylactic agents are often used.
Four months after cataract surgery, a patient has chronic low-grade granulomatous uveitis that responds partially to steroids, and a white plaque on the posterior capsule. What is the most likely organism?
Answer: Cutibacterium (Propionibacterium) acnes
Cutibacterium acnes causes delayed-onset chronic endophthalmitis with a characteristic white intracapsular plaque and often requires capsulectomy or IOL exchange.