Revive Custom | EyeKnow O.D.

Initial Fitting Guide

Method

Empirical. Measure horizontal visible iris diameter (HVID), keratometry, and refraction; no diagnostic lens set is needed.

Step 1

Pick lens diameter from HVID, then base curve from average K. HVID of 11.0 mm or less takes a 13.5 mm or smaller lens, 11.0 to 12.5 mm takes 14.0 or 14.5 mm, and 12.5 mm or more takes 15.0 mm or larger.

Lens diameter	Average K	Base curve
13.5 mm and smaller	50 to 49	7.7 mm
13.5 mm and smaller	48 to 45	8.0 mm
13.5 mm and smaller	44 to 41	8.3 mm
13.5 mm and smaller	40 to 38	8.6 mm
14.0 and 14.5 mm	50	8.0 mm
14.0 and 14.5 mm	49 to 46	8.3 mm
14.0 and 14.5 mm	45 to 42	8.6 mm
14.0 and 14.5 mm	41 to 38	8.9 mm
15.0 mm and larger	50 to 47	8.6 mm
15.0 mm and larger	46 to 43	8.9 mm
15.0 mm and larger	42 to 39	9.2 mm
15.0 mm and larger	38	9.5 mm

Step 2

Set distance power. Vertex the spectacle prescription to the corneal plane whenever the refraction is greater than +4.00 D or less than -4.00 D, and confirm axis orientation on the eye before ordering a toric. Single vision lenses can be ordered at this point; multifocals continue to Step 3.

Step 3

Set add power from the distance power.

Plano or minus: order the refractive add.

Revive Custom | EyeKnow O.D.