Unit 3

Question 1

function of Autorefractors

Answer 1

measure an approximation of a patient’s refractive
error, and are used as a starting point for the final prescription

Question 2

Phoropters (refractors)

Answer 2

are used to measure refractive error. Trial
lenses are still used in cases where a phoropter isn’t feasible, or
to show a patient a potential Rx.

Question 3

Slit lamp
biomicroscopes(corneal evaluation)

Answer 3

allow the examiner
to view anterior
structures of the
eye. A view of the
posterior
structures is
possible with a
handheld lens.

Question 4

Keratometer(corneal evaluation)

Answer 4

curvature of the cornea

Question 5

Topographer(corneal evaluation)

Answer 5

surface shape of the cornea

Question 6

Pachymeter(corneal evaluation)

Answer 6

corneal thickness

Question 7

nonmydriatic fundus camera and the optomap(imaging)

Answer 7

take images of the
retina. There are adapters available to do anterior segment photography.

Question 8

Tonometers(intraocular pressure)

Answer 8

measure the pressure inside the eye

Question 9

Noncontact tonometer(intraocular pressure)

Answer 9

does not touch the eye

Question 10

Visual field analyzers(special testing)

Answer 10

evaluate a patients range of vision

Question 11

Optical coherence tomographers(special testing)

Answer 11

create a cross section image
of the retina or anterior segment

Question 12

Ophthalmic ultrasound/Optical biometers (special testing)

Answer 12

are used to
measure and evaluate internal structures of the eye

Question 13

Standered methods of disinfection

Answer 13

• 70% isoproperyl/ethyl alcohol
• 3% hydrogen peroxide
• household bleach and cold water
• approved chemical germicide
• soak for 10 minutes then dry

Question 14

Retinoscope(handheld)

Answer 14

measure refractive error

Question 15

Ophthalmoscope(handheld)

Answer 15

view the retina

Question 16

Transiluminator(handheld)

Answer 16

fancy penlight

Question 17

Lensometer

Answer 17

messure eyeglassea and contact lens powers.

Question 18

Pupilometer

Answer 18

used to measure the distance between a patients pupils.

Question 19

Lens edging

Answer 19

• Trace frame to get the shape and size
• Lens blank ground down to fit into frame
  -Some models will groove the lens edge and drill holes

Question 20

Instrument Calibration

Answer 20

-checks accuracy of an instrument
- perform measurement on known sample
-“zero calibration”
- adjust instrument settings for the user