Bifocals began when Benjamin Franklin had the lenses of two different spectacles cut in half and wired into a single frame. As technology has advanced, more complex lens configurations were created, with multiple areas of magnification, called...
Bifocal contact lenses were developed for people with the eye condition known as presbyopia. Presbyopia typically develops after the age of 40 and involves the loss of your near vision. You will notice this condition particularly when you are...
When you suffer from presbyopia, you have difficulty focusing on objects up close. This condition typically appears after you turn 40 and is considered a natural part of the aging process of the eye, according to the American Optometric...
People who need bifocals no longer have to wear little half-glasses in addition to their contacts. According to the Contact Lens Manufacturers Association, multifocal contact lenses are available in bifocal, trifocal and progressive levels....
Bifocal lenses take some adjustment for many people, whether you start with bifocals or switch from regular lenses. New bifocal wearers might experience difficulty as they move from looking through the top to the bottom of the lenses. The bifocal...
Bifocal lenses and glasses are prescribed to correct a condition called presbyopia. People with presbyopia have problems seeing up close and at a distance. Rather than having two pairs of prescription glasses, one for near viewing and one for...
Bifocals are dual-vision glasses that allow the patient to see two different vision prescriptions through the same lens. Bifocals can often be identified because they look like a normal glasses lens with a portion of another lens resting on top,...
Bifocals are glasses with two prescriptions placed into one frame. There are several ways bifocal lenses are manufactured, depending on price and appearance. The most expensive lenses are progressive, where there is no discernible difference...
When you go snorkeling, you need to be able to see clearly to enjoy the experience and stay safe. Though you cannot wear glasses with a snorkel mask, people who wear glasses can use several different methods to seeing clearly in the water. You can...
Nearsightedness, or myopia is a common vision problem that affects about four out of every 10 people. People who are nearsighted have trouble seeing in the distance. Eyeglasses used to correct nearsightedness are either prescribed to be worn...
When small details and fine print become difficult to read or when a person has to hold printing at arm's length to read, he probably needs bifocals. Presbyopia is a condition that affects people beginning around the age of 40 and is corrected by...
Focus contact lenses include the DAILIES line produced by Ciba Vision. DAILIES are disposable lenses designed to wear for one day. Focus contacts also are available in weekly or monthly disposable versions. The lenses are made with a moisturizing...
Sooner or later, it happens to everyone: the feeling that your arms are not long enough to read small print. The term presbyopia is a vision condition that make focusing on close objects difficult. The Cleveland Clinic notes that most people over...
Contact lenses are able to treat a variety of eye problems by compensating for deficiencies in the eyes ability to focus light. Aspheric contact lenses are a special variety of contact lens that has somewhat different properties compared to...
In approximately the year 1000, Italian glass blowers began making hand-held reading stones, much like today's magnifying glasses. The first actual pair of eyeglasses was not invented until nearly 300 years later, out of magnifying glasses and...
Wearing multifocal contact lenses gives individuals the ability to focus through different strength prescriptions, but through the same lens. The technology uses a single lens for each eye rather than multiple lenses. One of the most common types...
Nearsightedness, also called myopia, causes good near vision but poor vision in the distance. This results from the eye not having a perfectly round shape, which changes the focus point of light entering the eye. Eye doctors detect nearsightedness...
If you wear contact lenses, you may be curious about some of the codes and numbers imprinted on the lens packaging. Optometrists prescribe contact lenses with different degrees of power to correct various vision problems. The Federal Trade...
Astigmatism occurs when parts of the eye (cornea, lens or the clear cover in the front of the eye) are abnormally curved, causing light to focus improperly on the retina (the part of the eye that converts images and light into brain signals). This...
Eye contact lenses were first developed in the 1960s, and have continually improved. The early contact lenses were known as hard contact lenses. That is, these lenses were rigid. They were made of a plastic called polymethyl methacrylate (PMMA)....
Eyeglass wearers can combine fashionable frames with superior lenses for the best in vision correction. Whatever your prescription, technological advances have made a variety of lens types available. Your optical professional can guide you to the...
Eyeglass prescriptions must be precise. Correcting vision allows little room for mistakes. The first time you put on a new pair of glasses, you expect your vision to be clearer and sharper than with your previous prescription. If, instead, your...
According to the Cleveland Clinic, about 2 million cataract surgeries are performed annually in the United States, and in nearly all of cases, the patients receive intraocular lenses after the surgeries. Before the development of intraocular...
Monovision contact lenses are designed for patients who suffer from presbyopia. According to the American Optometric Association, presbyopia occurs in people who are over the age of 40 and is the result of patients struggling to bring nearby...
According to the American Optometric Association (AOA), nearsightedness (myopia) is a vision impairment in which faraway objects are out of focus but objects near the eyes are clearly viewed. Nearsightedness is caused by either an excessively long...
Progressive lenses, also called no-line or invisible bifocals, are the most popular type of bifocal lenses, according to the June 2009 issue of "Eye Care Professional Magazine." Cosmetically, the lenses look nice, and progressive lenses offer a...
The contact lens prescription is essential for the proper vision correction and fit of the lenses. Without the prescription, you cannot, by law, obtain your lenses. You can, however, obtain your prescription from your eye care provider and then...
Contact lenses are designed to correct vision problems. There are four basic types of vision problems, and contact lenses work in different ways to correct them. The four basic vision problem types are myopia, astigmatism, hyperopia and...
Around 135 million people worldwide wear contact lenses, small corrective plastic discs that sit on the surface of the eye, MayoClinic.com reports. While contacts have many benefits, they also have many drawbacks and can cause serious...
