12 Questions
What is the index of the tear layer?
1.336
What percentage of refraction occurs in the cornea?
2/3
What is the process by which the crystalline lens varies its focal length?
Accommodation
What is the term for the distance between the focus and the retina when the accommodation is insufficient?
Lag of accommodation
In which refractive status is the image exactly in front of the retina?
Emmetropia
What is the average power of the cornea in diopters?
43.00-44.00 D
What is the purpose of a schematic eye model?
To represent the basic optical features of the real eye
Which scientist is credited with making a six-surface eye model?
Gullstrand
In Gullstrand's schematic eye, what is the refractive power of the unaccommodated lens?
43.05 D
What is the refractive index of the cortex of the crystalline lens in Gullstrand's schematic eye?
1.386
What is the radius of curvature of the lens in Gullstrand's schematic eye at the back surface?
6.0 mm
Which distance in Gullstrand's schematic eye is 3.6 mm?
Distance from corneal apex to front lens surface
Explore the concept of schematic eye models in primary eye and vision care, specifically focusing on the Gullstrand model. Learn about the mathematical or physical representations of the basic optical features of the human eye for study and experimentation.
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