• Whenever possible, the patient should continue to be fitted with the same post cataract lens design, since a dramatic change may cause adaptation problems. If you wish to upgrade an AL or ALFA wearer to a design with greater asphericity, choose the HyperAspheric for its ease of adaptation. These lenses are also excellent for non-Post-Cataract patients who have high plus prescriptions.
• The asphericity in the Post-Cataract lens varies by base curve--the higher the base, the greater the curve change. For this reason, it is important to use the base curve listed for the specified power range.

The following two pages contain detailed product descriptions and specifications to assist your lens selection for a particular Rx.

1.50 diopter average aspheric change.
Designed for higher powers, the small 40 mm bowl size combined with a carrier curve of 4.00 diopters greatly reduces thickness and weight. Frame shape and size are critical in minimizing the amount of lenticulation that is visible. Asphericity is minimal (1.50 diopter of drop). The lower asphericity tends to be better for patients who insist on rotating their eyes, rather than turning the head and using a fixed gaze.

Single Vision, Round 22 mm Bifocal, Flat-Top 22x16 Bifocal

ALFA (Full Field Aspherics) - (To be discontinued May 31,1996)

50. Diopter average aspheric change
    Same design as the AL but in a Full Field, 60mm form. Intended for lower to medium power aphakic prescriptions. Like the AL, the ALFA is an alternative to the Multiple Drop or HyperAspheric where normal eye rotation is required.

Lens Types Available:
Single Vision, Round 22 mm Bifocal, Flat-Top 22x16 Bifocal

0. Diopter average aspheric change.

The design of the HyperAspheric lens gives the patient a wide fixed field of view. While it is recommended that the patients learn to turn their head instead of rotating their eyes, the HyperAspheric allows the patient to retain some eye rotation providing for easy adaptation. This lens provides an attractive thin, light lens with reduced eye magnification. The HyperAspheric is our largest full field aspheric allowing for larger frame selection.

Lens Types Available:
Single Vision, Round 22 mm Bifocal, Flat-Top 22x16 Bifocal

4.00 Diopter average aspheric change.

The Multiple Drop has approximately 4 diopters of asphericity. This design provides a very thin lens, which greatly reduces eye magnification. The high degree of asphericity provides the widest field of view straight ahead, but generally requires patients to view with a fixed gaze (turn their head rather than move their eyes). This can increase the adaptation period for the patient who is switching from an AL or ALFA. The small 22x16 segment allows the patient to more easily view downward as, for example, in negotiating stairs.

Lens Types Available:
Single Vision, Round 22 mm Bifocal, Flat-Top 22x11 Bifocal

Round Bifocals 12.00 to 16.00 2.00 to 3.00 & 3.50

Flat-Top 22x11 12.00 2.00 to 3.00, 3.50 & 5.00

Flat-Top 22x11 14.00 to 16.00 2.00 to 3.00 & 3.50