It is generally known as ‘short sight’. People with short sight find it difficult to read and see at a distance.
It is generally known as ‘long sight’. It is characterized by an inability to focus on objects nearby. In extreme cases, one may not be able to focus on objects at any distance.
It is caused due to an irregularly shaped cornea. This condition can be corrected. This may be accompanied by short or long sight.
This is common with middle-aged people. It is accompanied by blurred vision at close points.
This condition is characterised by the inability of both eyes to focus on one object. A person suffering from it may see double objects and may suffer from blurred vision.