Mindblown: a blog about philosophy.
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Ocular refraction
Refraction of the eye referred to the principal point of the eye and (theoretically) corrected by a lens placed at the eye’s principal plane.
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Negacoll
A material used for making an impression of the eye, in the fitting of scleral contact lenses.
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Molded scleral lens
A scleral contact lens which is fitted by the process of taking an impression of the eye and making a mold.
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Microspherometer
An instrument used for measuring the radii of curvature of a contact lens.
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Micro-lens
In its original form, a plastic corneal contact lens of unicurve construction averaging about 9.5 mm. in diameter and fitted somewhat flatter than the optic cap of the cornea.
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Methyl methacrylate
A plastic material which is in general use in the fabrication of contact lenses. A polymer, made from methacrylic acid, used as a bone cement, bonding agent, drug-delivery vehicle, and tissue adhesive. Its operative use is sometimes associated with hypotension, fat or air embolism, or other complications.
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Methods of illumination
Methods used in connection with the slit lamp biomicroscope for illuminating and viewing various ocular structures.
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Measuring magnifier
A magnifier having a scale calibrated in 0.1 mm. steps. which can be used for measuring widths of optical zones, bevels, secondary curves, and overall diameters of contact lenses.
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Magnification, spectacle
The ratio between the size of the retinal image of an ametropic eye before and after correction.
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Magnification, relative spectacle
The ratio of the size of the retinal image in a corrected amctropic eye to that in the posterior focal plane of the same eye uncorrected.
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