Vision

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Where is the image of the object being viewed produced?

On the iris

On the pupil

On the retina (correct)

On the cornea

What is the function of the cornea?

To control the intensity of the light

To produce a real image of the object

To focus by refracting light rays (correct)

To regulate the amount of light entering the eye

What is the diameter of the pupil under normal light conditions?

4mm (correct)

5mm

2mm

3mm

What happens to the pupil's diameter in bright light?

It decreases to 3mm Signup and view all the answers

What is the function of the iris?

To regulate the amount of light entering the eye Signup and view all the answers

What is the function of the pupil?

To allow light to enter the lens Signup and view all the answers

What is the primary function of the choroid in the eye?

To provide the blood supply for the retina Signup and view all the answers

What is the purpose of the black pigment in the choroid?

To reduce the reflection of light within the eye Signup and view all the answers

What is the result of blockage of the drain tube (canal of schlemm) in the eye?

Glaucoma Signup and view all the answers

What percentage of the refractive power of the eye does the lens contribute to?

25% Signup and view all the answers

What is the function of the ciliary muscles in the eye?

To change the shape of the lens Signup and view all the answers

What is the role of the rods and cones in the retina?

To convert light energy into electrical energy Signup and view all the answers

What is the primary characteristic of the Fovea?

It contains only cones. Signup and view all the answers

What is the purpose of the accommodation process in the eye?

To ensure objects at various distances can be brought to a focus on the retina. Signup and view all the answers

What is the main reason we do not notice the blind spot in our vision?

Because each eye compensates by seeing what the other doesn’t. Signup and view all the answers

What is the main cause of farsightedness?

The lens is too weak. Signup and view all the answers

What is the purpose of a converging eyeglass lens?

To correct farsightedness. Signup and view all the answers

What is the main cause of astigmatism?

An irregular curvature of the cornea. Signup and view all the answers

What is the main reason for the development of presbyopia?

Decrease in the flexibility of the lens Signup and view all the answers

What is the term for the ability of the eye to see fine detail?

Visual acuity Signup and view all the answers

What is the range of wavelength of visible light?

≈ 400 nm - 700 nm Signup and view all the answers

What is the reason for the separation of white light into its constituent colors when passing through a prism?

Dispersion of light Signup and view all the answers

What is the reason for an object appearing green in color?

All wavelengths except green are absorbed Signup and view all the answers

What is the shape of the cornea that contributes to astigmatism?

Different curvature in different directions Signup and view all the answers

What is the main function of rods in the retina?

To detect low light levels Signup and view all the answers

How many types of cones are present in the retina?

3 Signup and view all the answers

What is the result of color blindness?

Absence of cones Signup and view all the answers

What is the effect of color fatigue?

Reduced response to a color Signup and view all the answers

Why is color matching important in dentistry?

To match the color of the dentine Signup and view all the answers