Frame measurements, fitting, and adjustment techniques tested on optician certification exams.
30 cards · basic cards · AI-written, checked twice. Edit anything.
- What is pupillary distance (PD)?
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Distance between the centers of the pupils, measured in millimeters, for lens positioning.- What does pantoscopic angle refer to?
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The angle of the eyeglass frame tilted downward at the temples, typically 8-10 degrees.- Define face form angle.
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The angle at which the frame sits on the face in profile, typically 8 degrees for standard fitting.- What is wrap angle in frame fitting?
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The angle at which the frame temples curve around the sides of the head, typically 0-3 degrees.- What is vertex distance?
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Distance from the back surface of the lens to the front of the cornea, standard is 12 mm.- How is bridge width measured?
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Distance in millimeters between the inner edges of the two lenses where they meet at the bridge.- What is the typical PD for an adult?
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54-74 mm for distance, with 58-68 mm being most common.- How are temple lengths measured?
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From the hinge to the end of the temple arm, measured in millimeters.- What is meant by frame alignment in fitting?
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Positioning the frame so lenses are centered on pupils and frame sits symmetrically on the face.- What is the purpose of adjusting pantoscopic angle?
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To position lenses properly for correct viewing angle and to reduce unwanted prism effects.- What tool measures pupillary distance?
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A pupillometer or PD ruler is used for direct measurement from the patient.- Define temple bend in frame adjustment.
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The bend at the temple where it angles downward from the frame front.- What is the standard bridge width range?
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Typically 14-24 mm, with 18-20 mm being most common.- How should a frame sit on the nose?
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The bridge should rest evenly across the nose with equal pressure on both sides, leaving no gaps.- What is the purpose of nosepads?
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To provide a comfortable base for the frame to rest on the nose and distribute weight evenly.
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