Eyeglass lenses are the transparent or semi-transparent parts of eyeglasses that are placed in front of the eyes to correct vision. They come in a variety of materials, shapes, and prescriptions to suit the needs of different patients.
The most common types of eyeglass lenses are:
- Single vision lenses: These lenses have the same prescription throughout the entire lens and are used to correct nearsightedness, farsightedness, or astigmatism.
- Progressive lenses: These lenses have multiple prescriptions in the same lens, allowing for a smooth transition between distance, intermediate, and near vision. They are often used by people with presbyopia, a condition that makes it difficult to focus on objects up close.
- Bifocal lenses: These lenses have two prescriptions in the same lens, one for distance vision and one for near vision. They are often used by people with presbyopia.
- Trifocal lenses: These lenses have three prescriptions in the same lens, one for distance vision, one for intermediate vision, and one for near vision.
Different lens materials include:
- Polycarbonate lenses: These are lightweight, impact-resistant, and scratch-resistant, making them a popular choice for children and athletes.
- Plastic lenses (Hi-index): This material is commonly used as it can be made as a lightweight, thinner lens when the index of the material is higher.
- Glass lenses: These are an old lens material option that are no longer used and are very durable, but very heavy and can break easily.
There are also different coatings and options that can be applied to lenses such as anti-glare coatings, scratch-resistant coatings, blue-light blocking coating, polarized lenses, and photochromic lenses.
Anti-glare coatings reduce glare and reflections, making it easier to see in bright light. Scratch-resistant coatings help to prolong the life of the lenses by making them more resistant to scratches. Polarized lenses reduce glare and improve vision in bright light, they are especially helpful for people who spend a lot of time outdoors. Photochromic lenses are clear indoors and turn dark in sunlight to reduce glare and improve vision.
When choosing eyeglass lenses, it is important to consider your lifestyle and visual needs. Our optometrist and opticians can help you select the right lenses for your prescription and provide guidance on which lens material and coatings are best for you.