Refraction / Keratometry Flashcards
In myopia, the image forms ______ the retina while in hyperopia, the image forms _____ the retina
myopia - front of retina
hyperopia - behind retina
The emmetropic eye focuses parallel light onto the retina when accommodation is _____
relaxed
In myopia, the power that the eye has has is ____ than what it needs. The discrepancy is ____ and the Rx is ____
In myopia, the power that the eye has has is more than what it needs. The discrepancy is plus and the Rx is minus
In hyperopia, the power that the eye has has is ____ than what it needs. The discrepancy is ____ and the Rx is ____
In hyperopia, the power that the eye has has is less than what it needs. The discrepancy is minus and the Rx is plus
The Rx is always ____ and ____ to the discrepancy
equal and opposite
Pinhole changes the ____ of each blur circle without changing the ____
Pinhole changes the size of each blur circle without changing the defocus (dioptric blur)
Whatever VA the patient has through pinhole, they should see ______ with refraction
at LEAST as well
What is Hofstetter’s formula for accommodation?
15 - 0.25(age)
Amplitude of accomodation peaks at age ___
14
accommodation is always ____
plus or 0
What do the values in B = LOAD stand for?
Blur Lens Object distance Accommodation Discrepancy
Define Fog
too much plus on purpose
What is the purpose of fog?
to relax accommodation
Why do young hyperopes often have perfect vision?
They can accommodate the difference
What are the three clouds of hyperopia?
- Asthenopia at near
- Earlier presbyopia
- Complete dependence on correction later in life
