title: Clinical evaluation of the anterior constant focus (ACF) annular bifocal contact lens.
abstract: We evaluated the distance and near vision of 33 presbyopic patients who wore the Anterior Constant Focus (ACF) rigid gas permeable (RGP) bifocal lens. Twenty-seven patients (82%) wore the lenses for one year; the six patients who quit the study complained of unacceptable vision (four patients) and discomfort (two patients). Twenty-five patients (76%) obtained 20/25 or better distance vision, and 28 patients (85%) obtained J2 or better near vision. Contrast sensitivity was within normal limits in 24 of 33 (73%) patients. We feel the ACF lens provides good bifocal vision in a non-translating RGP design.
authors.affiliation: Department of Ophthalmology, University of Kentucky, Lexington.
authors.forename: J R
authors.initials: JR
authors.lastname: Gussler
authors.forename: E S
authors.initials: ES
authors.lastname: Lim
authors.forename: G
authors.initials: G
authors.lastname: Litteral
authors.forename: W S
authors.initials: WS
authors.lastname: Van Meter
mesh_terms: D003261:Contact Lenses; D015350:Contrast Sensitivity / Q000502:physiology; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D011305:Presbyopia / Q000503:physiopathology / Q000628:therapy*; D012029:Refraction, Ocular; D014792:Visual Acuity / Q000502:physiology