Study Guide Flashcards
Phoropter
Refractometry, OMT
Refraction, opthamologist
Subjective
Objective
Starting points for refractometry
Retinoscopy, present glasses Rx, the patients last manifest refraction, auto refraction, estimating spheres or cylinder, keratometry readings
Myopic
Aligned & leveled
Spirit level
Makeup smears or fogging of the lenses
Plus direction , better, blurry or just lighter
Spherical power is checked first. We always start by presenting _ first
Plus power
When moving the sphere dial in the __we ask the patient if the letters are _
Minus direction, shaper & clear or darker &smaller
We use the ___to locate and refine the cylinder axis and power.
Jackson cross cylinder
In a __ we add cylinder power on the __and chase the __to refine cylinder axis.
Plus cylinder phoropter, white dot & white dot
In a __ we add cylinder power on the __and chase the __to refine cylinder axis.
minus cylinder phoropter, red dot & red dot
After completing a manifest refraction we need to make sure the vision is balanced in both eyes and also __.To check this we perform the __.
check to see that the patient is not over or under corrected in either eye. fog and balance technique.
Another way of checking if a patient is __ is to do the__. This test uses ___
Over minused, duochrome test, red/green balancing.Red light waves have a longer wavelength than green light waves
Green
Give plus
Red
Stop and think before you give minus
Red/green
Balanced
A __is a refraction performed with the ciliary muscle or accommodative system pharmaceutically inactivated.
cycloplegic refraction
A commonly used drop for cycloplegic refractions is__. This drop takes_
cyclopentolate, 30 – 60 minutes to reach maximum effect and lasts for 6 to 24 hours.
Vertex distance should be measured on any patient who has a refractive error greater than__diopters in any meridian on the power cross.
±4.00
The ophthalmic technician’s goal for every manifest refractometry performed for every patient is:
Accurately perform refractometry to ensure the patient reaches their Best Corrected Visual Acuity. (BCVA)!
b. Secure the best vision for each patient with manifest refractometry results that use the least minus or most plus sphere power necessary.
c. Secure the best vision for each patient with manifest refractometry results that use the least total cylinder power necessary.
