The human eye is capable of adjusting dynamically to varying levels of ambient illumination and different object distances.
a.[1]
Name the physiological process by which the optical power of the eye is altered to maintain a clear image of an object as its distance from the eye varies.
b.[1]
Which letter (X, Y, or Z) represents the retina, where light-sensitive photoreceptors are located?
c.[3]
Describe the state of the ciliary muscles, the suspensory ligaments, and the lens when the eye shifts its focus from a distant horizon to a nearby book.
d.[4]
Explain how the muscles in the iris react when a person moves from a dimly-lit environment into a highly-illuminated environment (such as bright sunlight), and explain how this reflex protects the eye.