61st ICLEP Day 3

 Q1 : What does a Grade 0 edge alignment indicate during scleral lens slit-lamp evaluation?

• A. Severe edge lift causing conjunctival staining

• B. Mild indentation of the conjunctiva

• C. Smooth alignment with continuous reflection line

• D. Moderate vessel impingement under the lens edge

Q2 : What is the recommended optimal central corneal clearance (vault) after scleral lens insertion?

• A. 50–80 microns

• B. 100–200 microns

• C. >400 microns

• D. 250–350 microns

Q3: In advanced keratoconus, which scleral lens design parameter is most critical for achieving proper vault over the cone?

• A. Central sagittal depth

• B. Limbal clearance

• C. Lens diameter 

• D. Edge thickness

Q4:  What is the primary reason for using a piggyback scleral lens system in highly irregular or sensitive corneas?

• A. To reduce visual acuity

• B. To flatten the cornea

• C. To improve oxygen permeability only

• D. To provide cushioning and improve comfort

Q5:  In cases of severe ectasia or irregular post-surgical corneas, why might a larger diameter scleral lens be preferred?

• A. To increase corneal neovascularization

• B. To reduce limbal clearance

• C. To provide better landing zone stability and vault

• D. To improve blinking efficiency

Q6. How many front surface eccentricity options are available in Boston Sight SCLERAL lenses?

• A. 1

• B. 2

• C. 3 

• D. 4

Q7. Choose the correct option for  front surface eccentricity values, in Boston Sight SCLERAL lenses?

• A. 0.1

• B. 0.2

• C. 0.4

• D. 0.6

Q8 : Which combination of scleral lens modifications is most effective in minimizing corneal Edema in a patient showing signs of hypoxia-related swelling after extended wear?

• A. Increase central clearance, add fenestrations, use low Dk material

• B. Decrease lens thickness, use high Dk material, add fenestrations

• C. Increase lens diameter, increase fluid reservoir, use high Dk material

• D. Add fenestrations, steepen peripheral curves, increase lens thickness

Q9: In keratoconus patients fitted with scleral lenses, which optical aberration is most consistently dominant and therefore most commonly targeted with wavefront-guided correction?

• A.  Vertical coma

• B. Trefoil

• C. Spherical aberration

• D. Chromatic aberration

Q10 : Which of the following best explains why scleral lenses can sometimes increase visual aberrations in patients with relatively regular corneas?

• A. They eliminate the tear lens, leading to refractive instability

• B. They create a highly irregular posterior lens surface

• C. Excessive central clearance introduces positive spherical aberration

• D. They compress the limbus, altering peripheral refraction