The outer hard layer of the eye (white of eye) is the:

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Question restatement: The outer hard layer of the eye (white of eye) is the:

Option 1: pupil – This is the opening in the iris through which light enters the eye, not the outer white layer.

Option 2: choroid – This layer lies between the sclera and retina and is involved in vascular supply; it is not the outer white coat.

Option 3: iris – The colored part of the eye surrounding the pupil; it controls pupil size, not the outer white protective layer.

Option 4: sclera – This is the tough, opaque, fibrous outer layer that forms the white of the eye and provides structural protection. It covers most of the eyeball except the cornea.

Explanation of why each option is correct or incorrect:
- Pupil: Incorrect because the pupil is merely an opening in the iris, not a protective outer layer. It allows light to pass into the eye but does not form the white coat.
- Choroid: Incorrect as it is a vascular layer beneath the sclera, supplying blood to the retina; it is not the outer white surface you can see.
- Iris: Incorrect since the iris is the colored diaphragm that controls the amount of light entering through the pupil; again, it is not the white outer coat.
- Sclera: Correct because it is the tough, fibrous covering that makes up the white part of the eye, giving shape and protection to the eyeball.

If you’re reviewing anatomical layers, remember the common ordering from outside to inside often described as: sclera (outer white coat), cornea at the anterior, then the uveal tract consisting of the choroid, ciliary body, and iris, with the retina lining the inner surface. The sclera’s distinctive whiteness is a helpful cue in identifying it during exam questions.

hk_264_120258_248438 Chapter 7 Self Test: Nervous System and Special Senses

The outer hard layer of the eye (white of eye) is the:

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