Eye Defects and Myopia Correction

Myopia, or near-sightedness, is a condition where distant objects appear blurry while nearby objects can be seen clearly. It can be corrected using a concave lens of suitable power to refocus images onto the retina.

Hypermetropia, or far-sightedness, is a condition where distant objects are seen more clearly than close ones, as images form behind the retina. It is corrected using a convex lens to bring the focal point forward onto the retina.

Presbyopia is the gradual loss of the eye's ability to focus on nearby objects due to aging, caused by the hardening of the lens. It commonly affects people over the age of 40.

<p>The main causes of myopia are excessive curvature of the eye lens and elongation of the eyeball. Both conditions result in images being focused in front of the retina.</p> Signup and view all the answers

<p>Having two eyes provides a wider field of view of about 180°, enhances the ability to detect faint objects, and improves depth perception through stereopsis. This allows for better spatial awareness and a three-dimensional understanding of the environment.</p> Signup and view all the answers

<p>A concave lens corrects myopia by diverging light rays, allowing them to spread out before entering the eye, which shifts the focus of distant images back onto the retina. This brings clarity to distant vision.</p> Signup and view all the answers

<p>In a myopic eye, the far point is the maximum distance at which objects can be seen clearly, and it is closer than infinity. This means the eye cannot clearly focus on distant objects.</p> Signup and view all the answers

<p>Accommodation is the eye's ability to adjust its focus from distant to near objects through changes in the lens shape. A loss of accommodation can lead to refractive defects like myopia or presbyopia, resulting in blurred vision for certain distances.</p> Signup and view all the answers

Nearsightedness; a refractive error where a person can see nearby objects clearly but distant objects are blurry.

Corrected using a concave lens, which spreads out light rays before they enter the eye.

Farsightedness; a refractive error where a person can see distant objects clearly but nearby objects are blurry.

A type of farsightedness that typically develops with age.

Depth perception; the ability to see objects in three dimensions, created by combining images from both eyes.

The area a person can see at one time.

The farthest point from the eye at which an object can be seen clearly.

A problem with the shape of the eye that prevents light from focusing properly on the retina.