abhiraj singh

JOURNAL ENTRY WEEK 2
Investigate the two types of sight defect- long-sightedness and short sightedness.
Find the following information:

what causes the defect
the symptoms displayed
propose what sort of lens may be used to correct each vision.

LONG SIGHTEDNESS

Long-sightedness or hyperopia is a common condition that affects the ability to focus. In a long-sighted eye the light focuses behind the retina, blurring the image.

he exact causes of long-sightedness are not well understood. It is known that the eyeballs of long-sighted people tend to be smaller than average, with less curved corneas – the main optical component of the eye. There may also be a hereditary component, as the children of long-sighted parents can be long-sighted.

SHORT SIGHTEDNESS

To understand what myopia is, it helps to know how our eyes focus. The diagrams below show normal vision, short-sightedness and corrected myopia.