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Mod E Unit 2 Optical

Teacher: Ms. Tiffiny
Horizontales
Vision in which there is simultaneous perception as well as fusion
Three dimensional vision possible only when binocular vision and fusion are present
Vertical position of prism such that the base is at 270 degrees on a degree scale
The process of combining two or more prisms to obtain the equivalent prismatic effect expressed as a single prism
An imaginary reference line used to specify cylinder or spherocylinder lens orientation and corresponding to the meridian perpendicular to that of maximum cylinder power
Segment a 10-mm deep ribbon-style segment containing a prismatic effect for near. The ribbon segment extends to the nasal edge of the lens blank.
Highest quality of vision in which there is simultaneous perception, fusion, and stereopsis
A lens made from a thin flexible plastic material, having concentric rings ever-increasing prismatic effect that duplicate the refractive effect of a powered spectacle lens
Grinding a portion of a lens so as to add a second optical center. Often used to create vertical prism in the lower portion of one lens for the purpose of alleviating vertical imbalance at near
The displacement of a lens optical center away from the wearer's line of sight for the purpose of creating a prismatic effect
The unit of measurement that quantifies prism deviating power; one prism diopter is the power required to deviate a ray of light 1 cm from the position it would otherwise strike at a point 1 m away from the prism
A rule that states that the decentration of a lens in centimeters times the power of the lens is equal to the prismatic effect
Verticales
Vision in which there is simultaneous perception
Vertical placement of prism such that the base is at 90 degrees on a degree scale
Grinding a portion of a lens so as to add a second optical center. It is often used to create vertical prism in the lower portion of one lens for the purpose of alleviating vertical imbalance at near. (synonym slabbing-off)
A slab-off lens that has base-down prism below the slab line, instead of base up
A schematic representation on which the two major meridians of a lens or lens surface are depicted
A reference point 2-4 mm above the prism reference point on progressive-addition lenses. The fitting cross is positioned in front of the pupil
That point on an ophthalmic prescription lens through which no prismatic effect is manifested
Binocular process in which each eye exerts the effort to fixate on the same object