Signs and symptoms
... Signs and symptoms of astigmatism may include: Distortion in portions of your visual field Blurring of vertical, horizontal or diagonal lines

Causes
... Your eye has two parts that focus images — the cornea and the lens. In a perfectly shaped eye, each of these focusing elements has a perfectly smooth curvature like the surface of a rubber ball....

When to seek medical advice
... If your degree of astigmatism is pronounced enough that you can''t perform a task as well as you want, or if your quality of vision detracts from your enjoyment of activities, see an eye doctor. An ey...

Screening and diagnosis
... Your eye doctor may use these tools in examining your eyes: Keratometer. With keratometry, your doctor uses an instrument called a keratometer to quantify the amount and orientation of corneal astigma...

Signs and symptoms
... Being nearsighted may mean: Distant objects appear blurry. You need to squint to see clearly. You have headaches caused by excessive eyestrain. Nearsightedness is often first detected during childhood...

Causes
... Your eye has two parts that focus images — the cornea, the clear front surface of your eye, and the lens, a clear structure inside your eye that changes shape to help focus objects. In a perfect...

When to seek medical advice
... If your degree of nearsightedness is pronounced enough that you can''t perform a task as well as you wish, or if your quality of vision detracts from your enjoyment of activities, see an eye doctor. H...

Screening and diagnosis
... Nearsightedness is diagnosed by a basic eye exam. Three kinds of eye specialists, each with different training and experience, can provide routine eye care: Ophthalmologists. An ophthalmologist is an ...

Signs and symptoms
... Being farsighted may mean: Nearby objects appear blurry. You need to squint to see clearly. You have eyestrain, including aching or burning eyes and, rarely, a headache. You experience general eye dis...

Causes
... Your eye has two parts that focus images — the cornea, the clear front surface of your eye, and the lens, a clear structure inside your eye that changes shape to help focus objects. In a perfect...

When to seek medical advice
... If your degree of farsightedness is pronounced enough that you can''t perform a task as well as you wish, or if your quality of vision detracts from your enjoyment of activities, see an eye doctor. He...

Screening and diagnosis
... Farsightedness is diagnosed by a basic eye exam. Three kinds of eye specialists, each with different training and experience, can provide routine eye care: Ophthalmologists. An ophthalmologist is an e...