Parts of RX
Eyeglass prescriptions are measured in this unit.
What is a diopter?
This is the device that makes optometrists famous for the question "one or two?" It has thousands of lens combinations that allows optometrists to determine what powers of lenses result in the best vision.
What is the refractor?
These frames typically don't have adjustable nose pads
What are plastic (or zyl) frames?
This is a condition in which a person doesn't have enough quality tears to lubricate and nourish the eye.
What is dry eye?
This is the white part of the eye.
What is the sclera?
This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness
What is the Sphere?
Using a high intensity light source, this device looks for any diseases or abnormalities in the anterior portion of the eye, which includes the eyelids, lashes, lens, conjunctiva, cornea, and iris.
What is the slit lamp?
The type of multi focal lens that includes distance, intermediate, and reading Rx in one lens
What are progressives?
This is a condition in which a person cannot see things clearly unless they are relatively close to the eyes. It is also known as nearsightedness.
What is myopia?
This part of the eye controls the amount of light entering the eye.
What is the iris?
The average range for this component on a RX is +0.75 to +3.00 D.
What is the reading or add power?
An optometrist uses this to shine light into the patient's eye to observe the reflection off the patient's retina.
What is a retinoscope?
The measurement for this type of lens is taken at the bottom of the patient's pupil.
What is a trifocal?
This is a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision.
What are cataracts?
This is the type of photoreceptor that is sensitive to dim light.
What are rods?
This is an example of what conversion?
-1.00 -0.50 x 180
-1.50 +0.50 x 90
What is transposition?
This instrument is used to measure the curvature of the cornea.
What is the keratometer?
If a person is complaining that they have to tilt his or her head downwards to see in the distance what is most likely wrong with their glasses?
What is the seg height measurement is too high?
This is a condition of increased pressure within the eyeball, causing gradual loss of sight.
What is glaucoma?
This is a semiliquid, jellylike substance that helps maintain the spherical shape of the eye.
What is vitreous humor?
This occurs when an irregularly shaped cornea or lens prevents light from focusing properly on the retina.
What is an astigmatism?
This instrument is specifically used to measure the intraocular pressure of the eye.
What is the tonometer?
The part of the frame that extends from the hinges to the ear piece, holding your frames on your face.
What are the temples?
This disease is caused by the deterioration of the central portion of the retina. It is the leading cause of vision loss, affecting more than 10 million Americans.
What is macular degeneration?
This is the exact center of the retina that is known for having the greatest visual acuity.
What is the fovea?