Contact lenses and method of fitting contact lenses

Details Contact lenses and method of fitting contact lenses Contact lenses and method of fitting contact lenses

1995-12-21

1998-11-10

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Methods of use

351200, A61B 300

Patent

active

058351922

ABSTRACT:
A design family of contact lenses includes a central area utilized for distance vision, surrounded by multiple alternating annuli of near and distance optical powers, surrounded by a peripheral distance zone. The design can also be used in intraocular lenses (IOL). The distance optical power is constant across the design family of lenses, but the near optical power increases as a subject's presbyopia increases. The design family of contact lenses can be fitted to a patient in a standard fashion by fitting both eyes to the best distance visual acuity (VA), and obtaining near acuity from the near annuli. A modified monovision method fits the patient's dominant eye with a contact lens as described having the full prescription distance power and fitting the nondominant eye with a contact lens as described having a distance optical power between the full prescription distance optical power and the near optical power. Specifically, the nondominant eye is fitted with a contact lens as described but having a distance power between 50% and 100% of the range between the prescription near and distance optical powers, biased towards the distance optical power.

REFERENCES:
patent: 4923296 (1990-08-01), Erickson
patent: 5024517 (1991-06-01), Seidner

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