The Beginning Of The Perceptual Process

Question 1

What is Accommodation?

Answer 1

• The change in the len’s shape that occurs when the ciliary muscles at the front of the eye tighten and increase the curvature of the lens so that it gets thicker.
• The increased curvature bends more light through the lens, pulling the focus point back for a clear image on the retina.
• As people get older, it becomes harder for them to observe objects up close or read due to changes in the lens and weaker ciliary muscles.

Question 2

Accommodation in Practice

Answer 2

• Our lens are constantly changing focus to allow us to see clearly at different distances.
• For example, portrait mode on iPhone cameras.
• In portrait mode, the camera focuses on a certain object and when you move the camera, the focus changes to another object in the environment.

Question 3

What is Presbyopia?

Answer 3

• Also known as old eye.
• This is the loss of the ability to accommodate.
• Can be dealt with by wearing reading glasses, which brings near objects into focus by replacing the focusing power that can no longer be provided by the lens.

Question 4

What is Myopia?

Answer 4

• This is also known as nearsightedness.
• The inability to see distant objects clearly.
• Occurs when the optical system brings parallel rays of light into focus at a point in front of the retina, so the image that reaches the retina is blurred.
• This problem can be caused by either refractive myopia , in which the cornea and/ or the lens bends the light too much, or axial myopia, in which the eyeball is too long.
• Corrective lenses can solve this problem.

Question 5

What is Hyperopia?

Answer 5

• This is also known as farsightedness.
• This is when people can see distant objects clearly but have trouble seeing nearby objects
• Due to the focus point for parallel rays of light being located behind the retina, usually because the eyeball is too short.
• Young people can bring the image forward onto the retina by accommodating.
• Older people, who have difficulty accommodating, often use corrective lenses that bring the focus point forward onto the retina.