Vision I Flashcards
A CONVEX lens will _____ light while a CONCAVE lens will ______ light.
- Converge
2. Disperse
Fxnl parts of Photoreceptors
Outer:
- Outer segment
- Inner Segment
Inner:
- Nucleus
- Synaptic body
Refractive power is measured in _____.
Diopters
Avg. diameter of a CONE in the retina?
1.5 micrometers
Synaptic Body
Connects with the HORIZONTAL & BIPOLAR Cells
How is Rhodopsin Formed?
Scotopsin + 11-Cis Retinal
Purpose of a tonometer
Used to measure INTRA-OCULAR pressure
Hyperopia
- Farsightedness
- SHORT Eyeball
What happens to Rhodopsin when exposed to light?
It begins to decompose
Refractive Index
The Ratio of the velocity of light in air traveling through a substance
Inner Segment
Contains Organelles
- Especially MITOCHONDRIA
Myopia
- Nearsightedness
- LONG eyeball
Focal point
- The point through which ALL Parallel rays of light will pass
- After passing through each part of the lens
Refractive Power
A measure of how much a LENS bends light waves
1 diopter equals what?
1 meter/ FOCAL length of a lens
In Dark conditions, what is the electro negativity inside the Outer segment? Why?
- -40 mV rather than -75
2. Due to LEAKY channels
B/w Rods and Cones, which one is more sensitive to the DARK?
Rods
Hyperopia can be fixed with what kind of lens?
Con-CAVE Lenses
Canal of Schlemm
Where aqueous fluid flows in from the Ant. Chamber
Outer Segment
Site of light sensitive Photo-Chemicals
Focal length
The distance from the Center of the Lens to the focal point
Max. VA for 2-point sources of light is what?
(Resolving Power)
1.5 - 2 micrometers
Normal Intra-ocular pressure is what?
15 mmHg
Refraction
Bending of light waves at an ANGULATED surface of transparent Material