Optical Models Of The Eye II Flashcards
Optical model that summarizes our knowledge of the eyes as an optical system
Schematic eye
Purpose of the schematic eye
To help formulate and solve common optometric problems
What parts of applied geometrics do you use a schematic eye for
- cardinal point, focal lengths
- axial image location
- image size (mag)
What can a schematic eye help with with optical defects
Refractive error
Accommodation
Optical aberrations
Diffraction
Trade offs for using schematic eye
Anatomical accuracy vs conceptual and computational simplicity
What was the schematic eye used for historically?
Emphasized paraxial calculations
What is schematic eye used for today
- emphasis on non paraxial calculations
- entire visual field
- image quality
Th 1911 Nobel prize was awarded to _________ for his contributions to the schematic eye
Gullstrand
How many surfaces do we typically use in a schematic eye
3
Bennett-rabbets, gullstrand
Models with equal cardinal points
Are functionally equivalent
Axial object position for whihc the image will be formed at infinity
1st focal point
Axial image point of an infinitely distant object
2nd focal point
Have the property that any incident ray which passes through the 1st one leaves the system as though from the 2nd one AND parallel to the incident ray
Nodal points
Located where the exiting rays parallel to the optical axis intersect the refracted rays coming from the 1st focal point
1st principal point
Located where hte incident rays parallel to the optical axis intersect the refracted rays converging to the second focal point
Second principal point
