Flashcards in Vision 1 - von Bartheld Deck (103)
Where is the focal point of a convex lenz?
in front of it
Where is the focal point of a concave (diverging) lens?
What is known as the distance of the focal point to the lens?
What is the basic unit of focal power?
what is the relation between diopters and focal length?
How do we determine focal power?
Focal power = Refractive index/ Focal length
Glaucoma is caused by a problem with (blank)
Aqueous humor drainage
the curvature of the (blank) controls accommodation
Is the accommodated lens for flat or more round?
What nucleus in the brainstem is activated during accommodation?
Edinger-Westphal nucleus of oculomotor
what ganglion is activated during accomodation?
Ciliary muscles (relax/contract) to cause the zonule fibers to relax
What structure is responsible for refractive power?
the ANTERIOR curvature of the cornea
can we adjust the curvature of the cornea?
can we adjust the curvature of the lens?
why, of course!
Presbyopia is the phenomenon of:
loss of accommodation with age
Myopia is more commonly known as;
hyperopia is more commonly known as:
myopia is a condition in which your eye is too (long/short) for your lens focal length?
hyperopia is a condition in which your eye is too (long/short) for your lens focal length?
What type of lens do you use to correct myopia?
concave (diverging) lens
what type of lens do you use to correct hyperopia?
What is an astigmatism?
blurry vision due to irregular curvature of the cornea or lens--can be football shaped
The blind spot is the (blank), where there are no cones or rods
What are the five cell types found in the retina?
1. Cones and rods
2. Bipolar cell
3. Horizontal cell
4. Amacrine cell
5. Ganglion cell
the cones and rods are the (deepest/most superficial) layer (as in closest to the light?
in what layer are the horizontal cells?
outer plexiform layer
are horizontal cells pre or post synaptic between bipolar cells and cones/rods?
are amacrine cells pre or post synaptic between bipolar cells and ganglion cells