The far point

The idea

The far point is the farthest point up to which the eye can see objects clearly; it is infinity for a normal eye, so a normal eye sees clearly between 25 cm and infinity.

How far can you see?

On a clear day you can look at a distant hill, and then at a nearby tree. Both look sharp to a person with normal vision.

What is the farthest distance at which a normal eye can see clearly?

• Infinity
• About 100 metres
• About 25 cm

Along the line of sight

Press Next step.

From near point to infinity

The far point is the farthest point the eye can see clearly. For a normal eye it is infinity. With the near point at about 25 cm, a normal eye sees clearly everything from 25 cm out to infinity.

The far point is the farthest point up to which the eye can see objects clearly. It is infinity for a normal eye, so a normal eye sees clearly between 25 cm and infinity.

Notes

The far point is the farthest point seen clearly: infinity for a normal eye, which sees clearly between 25 cm and infinity.

Check yourself

What is the far point of a normal eye?

A normal eye can see clearly objects that are between…

The farthest point up to which the eye can see objects clearly is called…

• 25 cm. 25 cm is the near point of a normal eye, not the far point.
• 2.3 cm. About 2.3 cm is the diameter of the eyeball. The far point of a normal eye is infinity.
• Infinity — correct. Yes!
• 25 cm and infinity — correct. Yes!
• zero and 25 cm. Objects closer than the near point of about 25 cm look blurred.
• 25 cm and 100 cm. The far point of a normal eye is infinity, so it sees clearly beyond 100 cm too.
• the near point of the eye. The near point is the minimum distance at which objects are seen most distinctly without strain.
• the far point of the eye — correct. Yes!
• the least distance of distinct vision. That is another name for the near point, the closest distance seen distinctly without strain.