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Eye structure, accommodation and common defects

Homeostasis and response • The human nervous system

Key concepts

What you'll likely be quizzed about

  • Key structures of the eye include the sclera, cornea, iris, pupil, lens, ciliary muscles, suspensory ligaments, retina, and optic nerve.
  • The sclera is the tough outer layer, while the cornea acts as a transparent front surface.
  • The lens, located behind the pupil, connects to the ciliary muscles through the suspensory ligaments.
  • The retina, positioned at the back of the eye, connects to the brain via the optic nerve.
  • Diagrams illustrate their relative positions and facilitate function mapping.

Flashcards

Test your knowledge with interactive flashcards

What is the far point of a normal human eye?

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Effectively infinity; distant objects focus with relaxed accommodation.

Key notes

Important points to keep in mind

Label diagram order: cornea → iris/pupil → lens → retina → optic nerve.

Ciliary muscle action controls lens shape via suspensory ligament tension.

Distant focus: ciliary relax → ligaments tight → lens thin; near focus: ciliary contract → ligaments slack → lens thick.

Rods for low-light sensitivity; cones for color and acuity; cones need bright light.

Myopia: focus in front of retina → correct with concave lenses; hyperopia: focus behind retina → correct with convex lenses.

Pupil diameter and receptor type determine effective vision in different light levels.

Optic nerve damage halts signal transmission regardless of optical correction.

Ray diagrams must depict incident rays, refraction at corrective lens, and final focus on retina.

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