Chapter 40, Problem 7RQ

Summary Introduction

To determine:

The way through which the eye’s lens changes shape to allow focusing on distant objects.

Introduction:

Eyes help to see and view different objects by forming the image on the retina, a part of eye serves as a screen for the purpose of image formation. Accommodation in dark and light areas is a function of the eye. The eye is the sensitive part that provides vision. It consists of photoreceptor cells, such as rods and cone cells responsible for image formation in night and day.

Summary Introduction

To determine:

The defects that make focusing on a distant object impossible and name that condition.

Introduction:

Normal eyes focus at the cornea that has rounded contours helpful for bending the light rays. The lens plays an important role for final and sharp focusing. The encircling muscle adjusts the shape of the lens. Vision deficiencies occur due to the shape of the eyeball in the eyes.

Summary Introduction

To determine:

The type of lens used to correct it and also the ways through which the lens does so.

Introduction:

Both nearsighted (myopia) and farsighted (hypermetropia) conditions can be corrected with the help of lenses (with appropriate shaped lenses) and laser surgery (reshapes the cornea).