Basics of the Different Kinds of Lenses
Our experienced Optician will explain these choices in greater detail. Here is an overview:
Progressives provide a smooth, gradual change in lens strength for seeing well at any distance. Consider them if you need glasses for distance and reading and find the split screen of bifocals or trifocals uncomfortable. More expensive than bifocals, they can be made with CR-39, polycarbonate, or high-index lenses.
High-index lenses are thinner and lighter than CR-39 or polycarbonate lenses, and they will work for even the strongest prescriptions. Expect to pay more than double for progressive high-index lenses
High-definition lenses offer sharper vision and better peripheral vision than standard technology. You might prefer them if you have more complex visual problems, such as cataracts or corneal scars. They can be made with CR-39, polycarbonate, or high-index lenses.
Trivex lenses are of a more scratch-resistant material than either CR-39 or polycarbonate lenses. They are usually recommended if you wear rimless or semi-rimless frames, or if you’re generally hard on eyeglasses.