The Eye Flashcards
1
Q
How is long sight caused
A
By the eyeball being too short or the eye lens being unable to focus
2
Q
How is short sight caused
A
By the eyeball being too long, or the eye lens being unable to focus
3
Q
What does range of vision mean
A
The eye can focus on objects between the near point and the far point
4
Q
How far is the near point
A
Approximately 25cm
5
Q
How far is the far point
A
Infinity
6
Q
What is the power of the converging lens
A
Positive
7
Q
What is the power of a diverging lens
A
Negative
8
Q
The focal length of a lens is determined by what
A
The refractive under of the material from which the lens is made
Curvature of the two surfaces of the lens
9
Q
What does the structure of the eye contain
A
Retina Lens Cornea Pupil Ciliary muscle Suspensory ligaments
