Unit 3 Flashcards
function of Autorefractors
measure an approximation of a patient’s refractive
error, and are used as a starting point for the final prescription
Phoropters (refractors)
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.
Slit lamp
biomicroscopes(corneal evaluation)
allow the examiner
to view anterior
structures of the
eye. A view of the
posterior
structures is
possible with a
handheld lens.
Keratometer(corneal evaluation)
curvature of the cornea
Topographer(corneal evaluation)
surface shape of the cornea
Pachymeter(corneal evaluation)
corneal thickness
nonmydriatic fundus camera and the optomap(imaging)
take images of the
retina. There are adapters available to do anterior segment photography.
Tonometers(intraocular pressure)
measure the pressure inside the eye
Noncontact tonometer(intraocular pressure)
does not touch the eye
Visual field analyzers(special testing)
evaluate a patients range of vision
Optical coherence tomographers(special testing)
create a cross section image
of the retina or anterior segment
Ophthalmic ultrasound/Optical biometers (special testing)
are used to
measure and evaluate internal structures of the eye
Standered methods of disinfection
- 70% isoproperyl/ethyl alcohol
- 3% hydrogen peroxide
- household bleach and cold water
- approved chemical germicide
- soak for 10 minutes then dry
Retinoscope(handheld)
measure refractive error
Ophthalmoscope(handheld)
view the retina
Transiluminator(handheld)
fancy penlight
Lensometer
messure eyeglassea and contact lens powers.
Pupilometer
used to measure the distance between a patients pupils.
Lens edging
- 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
Instrument Calibration
-checks accuracy of an instrument
- perform measurement on known sample
-“zero calibration”
- adjust instrument settings for the user
