Lecture 2: Retinoscopy Flashcards
what is static retinoscopy
when using the retinoscope in the process of distance refraction, we want the patients accommodation to be at 0 diopters.
____ is the ammetropia and is equal in amt but opposite in sign to the rx.
discrepancy
A perfect eye with a _____ ___ discrepancy focuses occur in ___ different meridians
sphero cylindrical; either meridian may be + or negative, but the meridians are not the same power.
what does BLOAD stand for
- B: blur
- L: lens
- O: Object’s vergence
- A: Accommodation
- D: Discrepancy
Since we start with a source focused on the retina B = _____
0
If L, O, A, and D are all 0; their sum is 0, and the rays are still parallel when they enter the world. Their focal is 100/0= 0 which means _____
infinity
If LOAD is equal to a minus number than the focal point is _____ _____
beyond infinity
If LOAD is equal to 0 then the focal point is at _____
infinity
If the patient is looking at distance then Object vergence is = to _____. If the eye is not accomodating then then A will be = _____. If there are no Lenses in place, L= _____
0; 0; 0
The retinoscopy reflesx mostion the doctor sees is dependent upon the:
- summation of LOAD and the distance from the doctors eye to the patients eye
If the doctors eye is 50 cm from the patients eye and the LOAD equal a ____ number or a number between ___ and _____ the motions observed will be ____. A positive number greater than +2.00 motion observed will be _____
minus; 0; +1.75; WITH; against.
What is working distance
distance from the doctors eye to the patients eye
If LOAD is too little ____, the retina will be conjugate with a point behind your eye and you will see ___ motion. If LOAD is too much ____, the retina will be conjugate with a point between the patients eye and your eye and you will see ____ motion
plus (more minus); with; plus; against
what are the four kinds of changes to look for when you move the streak?
- brightness of the reflex
- thickness of the reflex
- break in the reflex
- skew of the reflex
The orientation of the streak that give the extremes of ____ and ____ are principal meridians. The orientaitons of the streak that eliminate break and skew are principal meridians
brightness; thickness
