Mindblown: a blog about philosophy.
-
Sclerotic scatter
A method of llumination used in slit lamp biomicroscopy, in which the slit beam is directed toward the limbal part of the sclera from a wide angle, causing light to traverse the cornea by total internal reflection.
-
Scleral flange lens
A corneal lens having a scleral flange which stabilizes the lens so that residual astigmatism may be corrected with a front surface toroidal curve.
-
Schirmer test
A test of the quantity of tear secretion which makes use of a filter paper strip inserted into the lower fornix. Normally, 10-15 mm of the filter paper will be moistened within a period of five minutes. The use of an absorbent paper placed in the conjunctival sac as a test for patients with ocular…
-
Retro-illumination
A method of illumination used in slit lamp biomicroscopy, in which the slit lamp beam is focused on a surface which is beyond (or behind) the area being observed.
-
Residual astigmatism
Originally synonymous with internal astigmatism but is now often used to indicate any and all astigmatism present when a patient is wearing a contact lens. Such astigmatism may be due to the position and tilt of the contact lens and the toricity of its surfaces, as well as to internal ocular causes.
-
Refractive ametropia
Ametropia due primarily to variations in the refractive elements of the eye.
-
Radiuscope
An instrument used for determining the radii of curvature of a contact lens.
-
Pseudomonas aeruginosa
A species of pathogenic bacteria which can cause severe ulceration of the cornea (also called P. pyocyanea). Produces green-blue pigment (pyocyanine) on culture and in wound pus—hence the alternative name. Yellow pigment (fluorescein) may also be apparent. Gelatin-liquefying, ferments only glucose. Occurs as a pathogen in urine, burns, wounds etc., often with other bacteria. Growing…
-
Prism ballast lens
A corneal contact lens containing base-down prism, which gives added weight to the lower part of the lens and thus tends to keep the lens from rotating.
-
Preformed scleral lens
A scleral contact lens which is fitted by means of a diagnostic lens set, not requiring the taking of an impression of the eye.
Got any book recommendations?