Overview

Presbyopia is the gradual loss of your eyes' ability to focus on nearby objects. It's a natural, often annoying part of aging. Presbyopia usually becomes noticeable in your early to mid-40s and continues to worsen until around age 65.

You may become aware of presbyopia when you start holding books and newspapers at arm's length to be able to read them. A basic eye exam can confirm presbyopia. You can correct the condition with eyeglasses or contact lenses. You might also consider surgery.

Source: http://www.mayoclinic.com

Symptoms

Presbyopia develops gradually. You may first notice these signs and symptoms after age 40:

• A tendency to hold reading material farther away to make the letters clearer
• Blurred vision at normal reading distance
• Eyestrain or headaches after reading or doing close-up work

You may notice these symptoms are worse if you are tired or are in an area with dim lighting.

When to see a doctor

See an eye doctor if blurry close-up vision is keeping you from reading, doing close-up work or enjoying other normal activities. He or she can determine whether you have presbyopia and advise you of your options.

Seek immediate medical care if you:

• Have a sudden loss of vision in one eye with or without eye pain
• Experience sudden hazy or blurred vision
• See flashes of light, black spots or halos around lights
• Have double vision

Source: http://www.mayoclinic.com

Causes

To form an image, your eye relies on the cornea and the lens to focus the light reflected from objects. The closer the object, the more the lens flexes.

• The cornea is the clear, dome-shaped front surface of your eye.
• The lens is a clear structure about the size and shape of an M&M's candy.
• Both of these structures bend (refract) light entering your eye to focus the image on the retina, located on the inside back wall of your eye.

The lens, unlike the cornea, is somewhat flexible and can change shape with the help of a circular muscle that surrounds it. When you look at something at a distance, the circular muscle relaxes. When you look at something nearby, the muscle constricts, allowing the relatively elastic lens to curve and change its focusing power.

Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images. As a result, these images appear out of focus.

Source: http://www.mayoclinic.com

Diagnosis

Presbyopia is diagnosed by a basic eye exam, which includes a refraction assessment and an eye health exam.

A refraction assessment determines if you have nearsightedness or farsightedness, astigmatism, or presbyopia. Your doctor may use various instruments and ask you to look through several lenses to test your distance and close-up vision.

Your eye doctor likely will put drops in your eyes to dilate your pupils for the eye health exam. This may make your eyes more light sensitive for a few hours after the exam. Dilation enables your doctor to more easily view the inside of your eyes.

The American Academy of Ophthalmology recommends that adults have a complete eye exam every:

• Five to 10 years under age 40
• Two to four years between ages 40 and 54
• One to three years between ages 55 and 64
• One to two years beginning at age 65

You may need more-frequent exams if you have risk factors for eye disease or you need glasses or contact lenses.

Source: http://www.mayoclinic.com

Lifestyle and home remedies

You can't prevent presbyopia. You can help protect your eyes and your vision by following these tips:

• Have your eyes checked. Do this regularly even if you see well.
• Control chronic health conditions. Certain conditions, such as diabetes and high blood pressure, can affect your vision if you don't receive proper treatment.
• Protect your eyes from the sun. Wear glasses or sunglasses that block ultraviolet (UV) radiation. This is especially important if you spend long hours in the sun or are taking a prescription medication that increases your sensitivity to UV radiation.
• Prevent eye injuries. Wear protective eyewear when doing certain things, such as playing sports, mowing the lawn, or painting or using other products with toxic fumes. Nonprescription reading glasses generally don't provide safety protection.
• Eat healthy foods. Try to eat plenty of fruits, leafy greens and other vegetables. These foods generally contain high levels of antioxidants as well as vitamin A and beta carotene. They're also vital to maintaining healthy vision.
• Use the right glasses. The right glasses optimize your vision. Having regular exams will ensure that your eyeglass prescription is correct.
• Use good lighting. Turn up or add light for better vision.
• See your doctor immediately if you experience any of these symptoms — sudden loss of vision in one eye with or without pain, sudden hazy or blurred vision, double vision, or see flashes of light, black spots or halos around lights. Any of these symptoms may signal a serious medical or eye condition.

Source: http://www.mayoclinic.com

Risk factors

Certain factors can make you more likely to develop presbyopia, including:

• Age. Age is the greatest risk factor for presbyopia. Almost everyone experiences some degree of presbyopia after age 40.
• Other medical conditions. Being farsighted or having certain diseases — such as diabetes, multiple sclerosis or cardiovascular diseases — can increase your risk of premature presbyopia, which is presbyopia in people younger than 40.
• Drugs. Certain drugs are associated with premature presbyopic symptoms, including antidepressants, antihistamines and diuretics.