Optical Potpourri
This inventive person had the idea to mount the top halves of his distance lenses and the lower halves of his reading lenses in the same frame.
Ben Franklin
The Latin term for the left eye is
Ocular Sinister
In Dioptric units,
“Two is Two”,
“One is One”
and Plano is
Zero
This is a condition where the curvature of the cornea is not uniform in all meridians
Astigmatism
A frame front is twisted so that the planes of the lens are out of coincidence with each other, this is called.
X-ing
Although not the standard lens material today, lens clocks calipers, and surfacing tools are still calibrated to this index of refraction
1.53
The distance from the center of the corneal reflex of one eye to the center of the corneal reflex of the other eye, when an infinity distance object is being viewed is known as
Distance PD
Commonly, they are called the suspensory ligaments,
but more formally are called this
Zonular Fibers
This is the second layer of the cornea
Bowmans
Raising the nose pads in a metal frame would have this resultant fitting effect
Lower the frame front
Primary open angle is the most common form of this ocular disease
Glaucoma
According to Essentials for Ophthalmic Lens Work, the point on a lens where the prism equals that called for by the prescription is defined as this
PRP – Point of Prescribed Prism
Often referred to as cellulose acetate, another name of this plastic frame material is
Zyl
The portion of the cornea that is 5-6 cell layers thick and is known for its ability to divide and migrate to cover a wound
Epithelium
This device is used to cut the ends of screws, or shorten temples.
Chapple Pliers
Although this chemical may be used in removal of stubborn ink markings on a lens, it may severely mar the luster and finish of any Zyl frame
Acetone
The distance measured from the front surface of the eye to the back surface of an eyeglass lens is known as
Vertex Distance
This Name is associated with Ophthalmic lenses, instrumentation
frames and even an ocular gland
Zeiss
This layer constitutes about 90% of corneal thickness
Stroma
This file is used for filing off the ends of screws that are used to mount lenses in three piece mountings without the danger of scratching the back side of the lens
Riffler file
Sharpest vision is attained when rays of light come to a pinpoint focus at this central pit in the macula
Fovea Centralis
According to the boxing system, the distance Between the geometrical centers of each Eyewire of a frame can be noted by Three acronyms, one being GCD, Another acronym could be this
DBC – distance between centers or
FPD – Frame PD
Daily Double!
No, not the name for a blender, but the only orbital bone to
fit this category
Zygomatic
Daily Double!
This is the average corneal thickness in the central portion
0.5 mm
A straight edge placed horizontally across the inside of the frame front just below the Nose pads tests this typical frame alignment
Four Point Touch