Astigmatism

Astigmatism is a vision condition that occurs when the front surface of your eye, the cornea, doesn't have a perfectly spherical shape. This irregular shape doesn't allow the light to focus properly on the retina. As a result, your vision may be blurred at all distances. People with severe astigmatism will usually have blurred or distorted vision, while those with mild astigmatism may experience headaches, eyestrain, fatigue or blurred vision at certain distances. Normally, astigmatism can be optically corrected with properly prescribed eyeglasses and/or contact lenses.

Hyperopia (Farsighted)

Hyperopia (Farsighted) is a vision condition in which distant objects are usually seen clearly, but close ones do not come into proper focus. Farsightedness occurs if your eyeball is too short or the cornea has too little curvature, so light entering your eye is focused incorrectly (behind the retina). Common signs of farsightedness include difficulty in concentrating and maintaining a clear focus on near objects, eye strain, fatigue and/or headaches after close work, aching or burning eyes, irritability or nervousness after sustained concentration.

Myopia (Nearsighted)

Presbyopia

Presbyopia is a condition when crystalline lens may lose its elasticity and, therefore, losses its ability to increase its power or to accommodate for near objects. Presbyopia usually becomes noticeable in the early to mid-forties. Presbyopia is a natural part of the aging process of the eye. It is not a disease and it cannot be prevented. Some signs of presbyopia include the tendency to hold reading materials at arm's length, blurred vision at normal reading distance and eye fatigue along with headaches when doing close work. The loss of accommodation may be compensated for by the use of reading glasses or bifocals that supply the plus power necessary for near vision.