Question

When do we consider a person to be myopic?
A) He has poor near vision or blurred vision at all distances
B) He cannot identify colours
C) He has poor night vision
D) He can see fine up to close distance, but distant objects are a blur

Answer 1

Our ability to see objects is related with the working of our eyes. Any irregularities in the focusing power of the lens can cause vision problems. The surface of the cornea results in much of the refractive force of the eye.

Complete step by step answer:
Eye is the organ in our body that helps us to see objects. It’s working principle is the same as that of a camera. The major parts of the eye include the cornea, iris, pupil and lens and retina where the image is focused. Our eye lens is a type of convex lens and the image formed in the retina will be an inverted one. After image formation, the brain interprets the formed image by analysing the information passed through the optic nerve and we can identify the object as it is. This is the working of a normal eye.
Light first passes through the cornea and it gets refracted slightly. This light then travels through the pupil and falls on the anterior surface of the lens. The lens is connected with ciliary muscles by which it adjusts the focal length. If this process is hindered anywhere, we will have a defect in vision.
Myopic patients suffer difficulty in seeing distant objects and they could see near objects clearly. This is a refractive error of the eye. When the eyeball elongates disproportionately with the focusing power of the lens, the light rays will fall at a point in front of the retina rather than falling on its surface. So, a myopic patient will not be able to see distant objects clearly.

So, the correct answer is Option D.

Additional Information:
Vision impairments include myopia, hyperopia, presbyopia etc. Most of these defects are curable nowadays by using suitable lenses or by laser treatments etc.

Note: Myopia is also called short-sightedness. Person suffering from myopia can see the nearby objects clearly and the defect can be cured by placing a lens of suitable focal length in front of the eye. In the surgical treatment of myopia making deep radial incisions in peripheral parts of the cornea.