Reading the manufacturers' fitting guide, while not being included in our top 10 tips, should be a starting point before attempting any multifocal fitting; all multifocal lenses have their quirks and nuances and practitioners have often spent a great deal of time in pre-launch trials preparing such guides in order to achieve maximum success.
? Avoid phoropters - there is no place for them in multifocal lens fitting. Assess best vision sphere (BVS) and all other over-refractions with a trial frame and full aperture trial lenses using subjective spherical refraction, OR using a spherical single vision contact lens (avoids BVD issues) and spherical over-refraction. Calculation doesn't always work. For example, you would expect the BVS of +2.75/-0.50 x 180 to be +2.50DS, but your patient may well prefer +2.25 or +2.75.
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