Iris and Anterior chamber
Ophthalmology · Topic 6
Source: NMC CBME Curriculum 2024 · Volume III · Ophthalmology · Topic 6 · combined PDF page 416
Practice questions
- In a cross-sectional AS-OCT comparison of patients with bilateral acute iris transillumination (BAIT) and healthy controls, which pattern of angle measurements was reported?
- In the BAIT imaging study, AOD and TISA measurements showed which reported correlation pattern with other anterior-segment biometric measurements?
- Which pair of AS-OCT parameters showed good discriminatory ability for distinguishing BAIT eyes from healthy controls in the reported study?
- Mean IOP in the BAIT cohort decreased from 24.4 ± 16.2 mmHg at presentation to 14.7 ± 2.1 mmHg at 12 months. Which interpretation is statistically appropriate?
- A clinician observes reduced AOD750 MIN and TISA750 MIN in an eye being evaluated for BAIT. Based on the available study, which is the most defensible conclusion?
- A comparative cohort evaluated EVO+ V5 and EVO V4c implantable collamer lenses. Which postoperative difference was reported for TISA500?
- After ICL implantation, a study found a greater reduction in TISA500 with EVO+ V5. Which additional comparison result was reported?
- Which statement best summarizes the IOP findings in the EVO+ V5 versus EVO V4c cohort?
- In the ICL cohort, the negative correlation between vault and change in TISA500 was reported in which group?
- Why is the adjusted TISA500 comparison between the ICL models more informative than an unadjusted comparison alone?
- In a pediatric AS-OCT study, mean iris insertion distance from the scleral spur was 80.6 μm in PCG eyes and 143.7 μm in control eyes. How did the study interpret this difference?
- Which relationship between iris insertion distance and IOP was observed in the PCG AS-OCT study?
- Which statement about normalized trabecular meshwork intensity in the pediatric PCG study is correct?
- Which description best characterizes the design and imaging setting of the PCG iris insertion study?
- A child with PCG has a markedly elevated IOP. Based on the reported association analysis, what can be inferred from the iris insertion distance alone?
- During endothelial keratoplasty, air or gas repeatedly migrates posteriorly and the anterior chamber becomes unstable in an eye with altered iris-lens diaphragm anatomy. What rationale underlies the reported posterior pressurization technique?
- Which combination correctly describes the reported posterior pressurization technique during endothelial keratoplasty?
- After intravitreal BSS injection in the reported technique, how long was the needle maintained in position with gentle plunger control?
- Which anatomical or surgical circumstance was among those described as predisposing to anterior chamber instability during endothelial keratoplasty in the case report?
- What outcome was reported in the three cases treated with posterior segment BSS pressurization during endothelial keratoplasty?
- Which conclusion about posterior segment BSS pressurization is best supported by the available report?