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Limbal clearance
Clearance of the limbal area when a scleral contact lens is fitted.
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Lenticular lens
A lens having the power ground only in the central portion of the lens in order to reduce thickness and weight (either a spectacle lens or a contact lens).
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lensometer
An instrument used for measuring the vertex power of a lens.
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Internal astigmatism
Astigmatism due to the back surface of the cornea, the tilt of the crystalline lens, and other factors within the eye (often referred to as residual astigmatism).
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Intermediate curve
A back surface curve of a contact lens, which may be situated between the base curve and the secondary curve, or between the base curve and the peripheral curve.
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Indirect illumination
A method of illumination used with the slit lamp biomicroscope in which the beam is focused on a structure located to one side of the structure being observed by the microscope.
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Fusional convergence
Convergence induced by fusion stimuli without reflex as sociation with accommodation.
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Frothing
The presence of myriads of tiny air bubbles underneath a contact lens, due to the fact that air has been trapped underneath the lens.
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Fluorescein pattern
The dye pattern appearing underneath a contact lens when the tear fluid has been dyed with fluorescein and the eye is observed under ultraviolet light.
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Fluorescein
A substance which dyes the tear fluid when instilled into the eye, and is used in evaluating the fit of a contact lens by virtue of the fact that it fluoresces under ultra-violet light. Dye used in ophthalmology to detect certain defects of the cornea (injuries and foreign bodies) and other abnormalities and to determine…
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