Categories
Single Vision Lenses
Bifocal Lenses
bifocal lenses are divided into two distinct sections and optical powers. The top section corrects distance vision (myopia, hyperopia, or astigmatism) and the bottom corrects near vision (presbyopia). People with refractive errors, which is when the shape of the eye disrupts light signals to the retina, need eyeglasses to help them see clearly. Bifocal lenses work by bending light to focus correctly on the retina (the light-sensitive layer at the back of the eye) .
Many people develop presbyopia (loss of ability to focus on close objects) after age 40. Presbyopia is the most common reason people need bifocals. Bifocals also support focusing systems in children with certain eye conditions, including high myopia (using bifocals instead of single-lens glasses can slow its progression), amblyopia (lazy eye), and accommodative esotropia (when one eye turns in to see near objects).
Progressive Lenses
progressive lenses are a type of multifocal lens specifically for people who need corrective lenses to see distant and close up objects. These lenses allow you to see clearly at multiple distances without a bifocal line. The need for a progressive lens increases with age. By the age of 35 or 40, many people have difficulty focusing their eyes on nearby objects. This is known as presbyopia, and to compensate for this focusing problem, some people wear single-vision eyeglasses for distance, as well as reading glasses for close up. While this approach can work, PALs provide a simpler, more convenient solution to age-related vision problems.
Progressive lenses offer the benefits of a multifocal lens without a multifocal line. And since there’s a gradual shift in lens strength with a progressive lens, you don’t have to deal with any sudden changes in clarity, which are common with multifocal lines. Some people find that a progressive lens is better than a single-vision lens because it allows them to see clearly at different distances without the need to carry a second pair of eyeglasses. A progressive lens does the job of a single-vision lens and reading glasses, so that you only have one pair of glasses on hand.
Contact Lenses
contact lenses are thin, curved lenses that are placed on the surface of the eye to correct vision. They work by bending light to focus correctly on the retina (the light-sensitive layer at the back of the eye). Contact lenses can be used to correct a variety of vision problems, including nearsightedness (myopia), farsightedness (hyperopia), astigmatism, and presbyopia.

