Optics and Vision - Crystalline Lens Quiz

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What happens to the curvature of the crystalline lens when the tension in the ligaments is at maximum?

The lens flattens. (correct)
The lens remains unchanged.
The lens becomes more spherical.
The lens increases in size.

What is the maximum distance from the eye where objects form sharp images called?

Far point (correct)
Optical limit
Focus point
Vision range

What condition is characterized by a lack of appropriate accommodation in the eyes due to aging?

Astigmatism
Myopia
Presbyopia (correct)
Hyperopia

Which factor does NOT contribute to the loss of accommodation with age?

Increase in eye size (C) Signup and view all the answers

If Beth's glasses are 2.5 cm in front of her eyes and she holds the newspaper 30 cm away, what is the object distance used in the calculation of her glasses' optical power?

0.275 m (A) Signup and view all the answers

What is the sign convention for the distance from a lens to a virtual image?

Negative (D) Signup and view all the answers

Which type of lens is used to correct hyperopia?

Convex lens (D) Signup and view all the answers

In the thin-lens equation, what does a positive focal length (f) indicate?

Converging lens (B) Signup and view all the answers

What is the optical power of Beth's new glasses, calculated using the thin-lens equation?

1.73 D (B) Signup and view all the answers

What condition results from a focal length that is too long, causing difficulty in seeing close objects?

Hyperopia (B) Signup and view all the answers

What is the primary function of the crystalline lens in relation to light?

To refract light and focus images on the retina (C) Signup and view all the answers

Which model of the eye is described as having a uniform refractive index within the crystalline lens?

Schematic eye 1 (B) Signup and view all the answers

What is the formula used to calculate the refractive power of an interface?

$P_{i,i+1} = \frac{n_{i+1} - n_{i}}{R_{i,i+1}}$ (D) Signup and view all the answers

What is the refractive power calculated for the air/anterior cornea interface?

48.35 D (C) Signup and view all the answers

Which model of the eye contains only one refractive interface?

Reduced eye (A) Signup and view all the answers

What is the condition where a person can see near objects clearly, but not distant ones?

Nearsightedness (C) Signup and view all the answers

What is the far point distance for a person suffering from refractive myopia who cannot see objects clearly beyond 10 meters?

10 meters (C) Signup and view all the answers

What optical power of corrective lenses is required for a person whose far point is at 10 meters and needs to see clearly at 100 meters?

-0.09 D (D) Signup and view all the answers

Which type of photoreceptor in the human eye is primarily responsible for color vision?

Cones (D) Signup and view all the answers

What is the near point distance considered normal for the human eye?

25 cm (D) Signup and view all the answers

Refractive Power of an Interface

The refractive power of an interface between two media is determined by the difference in refractive indices of the two media and the radius of curvature of the interface.

Reduced Eye Model

The simplest eye model; it considers only one refractive interface at the cornea, and distances are relative to this interface.

Schematic Eye 1

An eye model where the refractive index within the crystalline lens is uniform and the eye has four interfaces.

Power (Diopters)

A unit of measurement for the refractive power of an optical system, such as an eye. It is calculated as (n2 - n1)/R where n1 and n2 are the refractive indices and R is the radius of curvature.