Understanding How the Human Eye Adjusts to Different Distances

The video explains the power of accommodation in the human eye, focusing on how the ciliary muscles adjust the lens's curvature to change its focal length. This adjustment allows the eye to focus on objects at varying distances. The video also discusses the limits of accommodation, such as the near point and the far point, which define the range within which the eye can see clearly. For a normal eye, the near point is about 25 centimeters, and the far point is at infinity.

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

• To modify the shape of the lens

• To produce tears

• To protect the eye from dust

• To detect light

How does the eye lens change when viewing nearby objects?

• The lens becomes opaque

• The lens becomes thinner

• The lens becomes thicker

• The lens remains unchanged

What happens to the focal length of the lens when the ciliary muscles relax?

• It decreases

• It becomes zero

• It remains the same

• It increases

What is the least distance of distinct vision for a young adult with normal vision?

• 50 centimeters

• 10 centimeters

• 100 centimeters

• 25 centimeters

What is the far point of the eye for a person with normal vision?

• 50 meters

• 100 meters

• Infinity

• 1 kilometer