Self-test questions: Chapter 14

. Vision in bright light is known as photopic vision.

True

False

. The muscles controlling the diameter of the pupil are both innervated by the sympathetic nervous system.

True

False

. Which of the following statements regarding the focusing of the eye are correct? Please select all that apply

Myopia may be corrected by a diverging lens.

Hyperopia (hypermetropia) may be corrected by a diverging lens.

The cornea is the chief refractive element of the eye

The lens permits the eye to focus at different points in space

When the eye focuses on a distant object, the ciliary muscle contracts

The focus of the eye is controlled exclusively by the parasympathetic innervation of the ciliary body.

. Which of the following statements regarding the physiology of the eye is correct?

The pressure within the eye (the intraocular pressure) is about 1.5 mm Hg (0.2 kPa).

When light is shone in one eye, both pupils constrict.

The pupils dilate when the eye is focused on a near object

The aqueous humour is an ultrafiltrate of plasma.

. Which of the following statements regarding the physiology of the eye is true?

The pressure within the eye (the intraocular pressure) is maintained by the secretion of the aqueous humour.

The pressure within the eye (the intraocular pressure) is maintained by the vitreous humour.

. If intraocular pressure becomes excessively high it may cause a condition known as glaucoma.

True

False

. Which of the following statements about vision is correct?

Protanopes cannot distinguish between red and green because they lack the pigment for detecting green light.

Full colour vision is possible in dim light.

Full dark adaptation takes nearly 30 minutes.

In a dark-adapted eye, the visual acuity is best at the centre of the visual field.

. The direction of the gaze is determined by the extraocular muscles

True

False

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