Clearlab's fitting guide directs the practitioner to trial-fit, choosing the steeper base curve first, then judge against the criteria for a well-fitted lens: centres after a blink, bridges the limbus onto the sclera by about 1.25 mm, and lags 1.0 to 1.5 mm on upgaze.

Clearlab's fitting guide prefers a trial lens, taking the steeper base curve first. Its keratometry shortcut gives one stock design: for an average K of 39.50 to 41.50 and higher, 8.6 mm base curve / 14.2 mm diameter.

Convert the spectacle Rx to minus-cylinder form, vertex-compensate both principal meridians to 0 mm, then add half the cylinder to the sphere. Clearlab's keratometry shortcut gives one stock design: for an average K of 39.50 to 41.50 and higher, 8.6 mm base curve / 14.2 mm diameter. Trial-fit and judge lens rotation off the single 6 o'clock line.

Clearlab's fitting guide prefers a trial lens, taking the steeper base curve first. Its keratometry shortcut gives one stock design: for an average K of 39.50 to 41.50 and higher, 8.7 mm base curve / 14.5 mm diameter.

Clearlab's fitting guide prefers a trial lens, taking the steeper base curve first, and gives three stock designs by average K: 41.25 and lower, 8.9 mm / 14.5 mm; 41.50 to 45.50, 8.6 mm / 14.5 mm; 41.75 and higher, 8.3 mm / 14.5 mm, which is not available in plus powers.