ABO Domain 2: Contact Lenses Welcome to your ABO Domain 2: Contact Lenses 1. ABO: Contact Lenses What is the primary mechanism by which silicone hydrogel contact lenses improve oxygen permeability compared to traditional hydrogel lenses? A. By increasing water content B. By incorporating silicone into the lens material C. By reducing the lens diameter D. By thinning the lens profile None 2. ABO: Contact Lenses In fitting astigmatic patients with toric soft contact lenses, which of the following factors is MOST critical in ensuring optimal visual acuity? A. The water content of the lens B. The stabilization mechanism of the lens C. The diameter of the lens D. The base curve of the lens None 3. ABO: Contact Lenses What is the purpose of incorporating UV-blocking agents into contact lens materials? A. To enhance the wettability of the lens surface B. To reduce the risk of developing cataracts and other UV-related ocular conditions C. To improve the oxygen permeability of the lens D. To increase the lens's resistance to protein deposits None 4. ABO: Contact Lenses When considering the fit of rigid gas permeable (RGP) lenses, "apical clearance" refers to: A. The lens completely covering the corneal apex without touching it B. The lens resting directly on the corneal apex C. The alignment of the lens edge with the limbus D. The lens vaulting over the corneal apex with a thin layer of tears beneath None 5. ABO: Contact Lenses For patients with presbyopia wearing multifocal contact lenses, the term "simultaneous vision" refers to: A. The ability to see near and far objects clearly but not at intermediate distances B. The need to physically move the eyes to switch between near and far vision C. The eye receiving images from both near and distance zones at the same time D. Sequential focusing on near and distant objects, requiring adjustment time None 6. ABO: Contact Lenses What is the primary reason for utilizing a "back surface toric" design in rigid gas permeable (RGP) lenses for certain corneal shapes? A. To improve lens stabilization on the cornea B. To enhance oxygen transmission through the lens C. To match the lens to the toric shape of the cornea for better fit D. To increase the lens's resistance to deposit formation None 7. ABO: Contact Lenses When fitting contact lenses for a patient with keratoconus, why is it often necessary to use a specially designed keratoconic lens rather than a standard RGP lens? A. To increase the water content of the lens for better hydration B. To provide a larger optic zone for improved peripheral vision C. To accommodate the conical corneal shape for improved comfort and visual acuity D. To reduce the oxygen permeability required for the thinned cornea None 8. ABO: Contact Lenses In soft contact lens wearers, the phenomenon of "lens dehydration" can lead to discomfort. What is a common cause of this issue? A. Excessive tear production B. High water content in the lens material C. Low humidity environments D. Decreased blink rate None 9. ABO: Contact Lenses For contact lens wearers, the risk of developing microbial keratitis is most closely associated with: A. Daily wear of silicone hydrogel lenses B. Extended (overnight) wear of any contact lens type C. Use of daily disposable lenses D. Wearing RGP lenses with a high Dk/t value None 10. ABO: Contact Lenses What is the primary benefit of using a "plasma treatment" on the surface of RGP lenses? A. To enhance the hydrophobic properties of the lens surface B. To increase the lens's resistance to scratches C. To improve the wettability and surface lubricity of the lens D. To extend the usable life of the lens by preventing protein deposits None 1 out of 10 Time is Up! Time's up
