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20 Cards in this Set
- Front
- Back
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X axis |
The horizontal or 18 degree meridian |
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Optical generator |
Machine used for surfacing the back of ophthalmic lenses |
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Prism |
Triangular shaped piece of glass or plastic that deviates the light. |
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Base down |
Vertical placement of a prism in a downward position |
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Base in |
Horizontal placement of a prism in a base direction that is towards the nose |
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Base out |
Horizontal placement of a prism in a base direction that is towards the temple |
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Base up |
Verticle placement of a prism in an upward position |
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Bicentric grinding |
Surfacing a portion of a lens to create a second optical center. To correct for verticle imbalance. Also known as slab off |
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Binocular vision grade 1 |
Vision in which there is simultaneous perception |
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Binocular vision grade 2 |
Vision in which there is simultaneous perception as well as fusion |
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Binocular vision grade 3 |
Highest quality of vision in which there is simultaneous perception, fusion,and stereopsis |
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Strabismus |
The condition whereby one eye is pointed in a different direction than the other eye |
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Decentrarion |
The displacement of a lens optical center away from the wearers line of sight for the purpose of creating prismatic effect |
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Fusion |
Binocular process in which each eye exerts the effort to fixate on the same object |
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Prentice rule |
A rule used to determine unwanted prism |
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Prism diopter |
The unit of measurement that denotes deviating power |
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Y axis |
The 90 degree or vertical meridian |
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Stereopsis |
Three dimensional vision possible only when binocular vision and fusion are present |
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True image |
The retinal image in the normally fixating eye in strabismus |
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False image |
The retinal image in the deviating eye in strabismus |
