Adaptations in eyes:
Bright light:
Circular muscles contract, radial muscles relax, pupil constricts.
Dim light:
circular muscles relax, radial muscles contract, pupil dilates.
Focusing on distant objects:
Lens less convex, ciliary muscles relax, suspensory ligaments pulled tight.
Focusing on nearby objects:
Lens more convex, ciliary muscles contract, suspensory ligaments slack.