RCL Quiz

Which one of the following is the reason for the decline in popularity of RCL wear?

• RCLs have worse visual quality than SCLs

• RCLs are too expensive

• Increased prescription ranges and types available in SCLs

• RCL wearers have an increased likelihood of developing microbial keratitis (MK) than SCL wearers

If a RCL had a steep primary fluorescein pattern (PFP), the resultant over-refraction (OR) would likely be...?

• Positive

• Negative

Given a spectacle prescription of -2.00/-1.50 x 95, what would be the appropriate BVP to choose for a spherical RCL?

• -2.00

• -1.50

• -3.50

• -0.50

What dioptric change corresponds to each 0.05 mm difference in keratometry readings?

Which one of the following values should be subtracted from HVID to determine the Total Diameter (TD) for a RCL?

• 0.5mm

• 1mm

• 2mm

• 3mm

What Dk value is recommended for daily wear RCL material?

• Dk > 20

• Dk > 40

• Dk > 50

• Dk > 60

Which materials are suggested for RCLs?

• Polymethyl methacrylate and silicone acrylates

• Silicone acrylates and fluorosilicone acrylate

• Hydrogel and polymethyl methacrylate

• Fluorosilicone acrylate and hydrogel

Which one of the following is the primary purpose of edge lift in a RCL?

• To improve centration by aligning the lens with the cornea

• To enhance structural integrity and load distribution

• To enable tear exchange and metabolic by-products to exit from underneath the lens

• To enable lens movement

'A trial lens is ordered based on measurements taken from the patient' - describes which of the following?

• Empirical fitting

• Diagnostic fitting

Which of the following describes the grading of 'P' for RCL lens centration:

• Adequate centration

• Perfect centration

• Lens crosses limbus

• Lens crosses pupil in dim conditions