Materials & Coatings
Single Vision Lenses
Single vision lenses are designed to correct vision when a patient requires correction at one distance. Single vision lenses correct one fixed field of focus at either distance vision (Driving), intermediate vision (Computer), or near vision (reading). Single vision lenses also deserve consideration as a second pair of glasses; to compliment a pair of multifocal lenses, as a task-specific solution (ie. heavy reading usage).
Multifocal or Progressive lenses are designed to provide seamless vision at all distances for the presbyopic patient that requires help at both distance and reading. These lenses are variable focus with no visible lines, and provide more natural vision then any of the lined bifocals. Today there are as many as 250 different brands of progressive lenses available, with varying levels of advantages and disadvantages. The newer lens designs have made great strides in ease of adaptation, of use and wearer comfort; successfully addressing the disadvantages of older lens designs.
Lens Materials & Coatings
There are many different lens materials ranging from conventional plastic to state-of-the-art High Index materials that make lenses thinner and/or lighter than ever before possible. A lens’ index of refraction is the measure of how steeply a material bends light. The higher the index of refraction, the more steeply it bends light; hence, the thinner the lens can be made.Just as with lens materials, there are a variety of coatings and tints that can be applied to either side or both sides.