COA Flashcards - Supplemental Skills 8% of exam
Which color defects may be distinguished by the Ishihara test?
Red and green
Which color vision test consists of pseudo isochromatic plates that determine red-green color anomalies and deficiencies?
Ishihara
How long are the Schirmer strips left in place during a tear test?
Five minutes
A-scan biometry measures the distance between _____.
Internal ocular surfaces
The chief use of A-scan biometry is to measure the _____ _____ of the eye.
Axial length
How is anterior chamber depth estimated using a slit lamp?
A high thin beam is placed at the limbus at an angle of approximately 60 degrees and the distance between the posterior limit of the corneal beam and the anterior limit of the iris beam is compared with the thickness of the optical section of the cornea.
Which two ocular structures can touch if the anterior is flat?
Iris and cornea
When determining anterior chamber depth using a flashlight test, a shadow on the nasal iris indicates _____.
Abnormally shallow anterior chamber (narrow angle)
Ophthalmologists often estimate anterior chamber depth by measuring the angle between the a) _____ b) _____.
a) anterior surface of the iris b) posterior surface of the cornea
What is the name of the instrument used to measure extension of the anterior surface of the cornea beyond the lateral orbital rim?
Exophthalmometer
Name at least one example of a glare testing device
TVA, BAT (Brightness Acuity Test), or EyeCon
When performing A-scan biometry, a 1mm error in axial length may result in a _____ diopter calculated IOL power error.
Three
Name the two measurements required to determine the dioptric power of the intraocular lens
A-scan (axial length of the eye) and keratometry (corneal curvature)
What is the term for the amount of time it takes for dry spots to form on the cornea when the eye is in a starting position?
BUT (break-up time)
_____ _____ is a red dye useful in evaluating the integrity of the corneal epithelium.
Rose bengal
