RCL Quiz

What is one of the reasons for the decline in popularity of RCLs?

• Worse visual quality

• Too expensive

• More ranges of SCL available

• Higher risks of MK

What is created when the front surface of the cornea is neutralised using the posterior lens surface in an RCL?

• A vacuum

• A tear lens

• A refractive index

• A focal point

What is the purpose of bi-curve, tri-curve, and multi-curve designs in lens design?

• To decrease the weight of the lens

• To increase the aesthetic appeal of the lens

• To mimic corneal flattening by progressively increasing each radius of curvature

• To reduce the cost of lens production

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

How much diopter change corresponds to each 0.05mm difference in K readings?

What type of astigmatism must be present as a mismatch between spectacle astigmatism and corneal astigmatism?

• Lenticular astigmatism

• Corneal astigmatism

• Refractive astigmatism

• Myopic astigmatism

What should be subtracted from HVID to determine the Total Diameter (TD) for an initial RCL?

• 1mm

• 2mm

• 3mm

• 0.7mm

How much larger is the BOZD typically set compared to the max pupil diameter to avoid flare?

• 0.5mm

• 0.7mm

• 1mm

• 2mm

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