The type of prescription eyeglass lenses you choose is determined by your lifestyle and your needs. It is not determined by your doctor, although a doctor can help you make your decision. For example, if you need your glasses only for distance vision, or only for reading, then single vision lenses are the best choice.
Choose
progressive lenses if your prescription has a reading addition AND you want your prescription glasses lenses for both distance and reading/computer vision. Progressive lenses are also known as "no-line" bifocals; they are great for most people, but some people
experience problems with progressive lenses. In these cases, regular bifocal lensess or trifocal lenses may be a better choice.
For us to make progressive lenses in new frames, we may ask you for a segment height measurement. For replacement lenses, we can read the segment height from the lenses so you don't need to send it to us.
Choose A Lens Material Based on Your Prescription
Most of the time, your prescription will determine the best lens material to use. In general, a
high index lens will be thinner, but ONLY if you have a high enough prescription. If your prescription is under +/-3.00, then spending more money on a higher index lens will not help you. Conversely, the thinnest lenses for a high prescription will be the higher index lenses.
Regular Plastic/CR39/1.56 Index Lenses
Good for glasses prescription up to +/-3.00. Least expensive. Cannot be used for
rimless glasses.
Polycarbonate, 1.59 Index Lenses
Good for prescriptions up to +/-5.00. Used for sporting activities,
prescription sunglasses,
kids glasses, and
prescription safety glasses. 1.67 High Index Lenses
Good for prescriptions from +/-5.00 to +/-8.00.