Single vision lenses contain one prescription across the entire lens surface, designed to correct vision at a single distance. These are the most common eyeglass lenses, ideal for people who need correction for either near vision tasks like reading and computer work, or distance vision activities such as driving and watching television. 

Progressive lenses offer three prescription strengths within one lens, near, intermediate, and distance, with seamless transitions between each zone. Unlike bifocals with visible dividing lines, progressives provide a natural, gradual change in lens power, creating uninterrupted vision at all distances. These multifocal lenses are ideal for people over 40 experiencing presbyopia, eliminating the need to switch between reading glasses and distance glasses. 

Bifocal lenses feature two distinct prescription zones separated by a visible line across the lens. The upper portion corrects distance vision while the lower segment provides magnification for reading and close-up work. Although progressive lenses have become more popular, bifocals remain a practical choice for people who prefer clear distinction between viewing zones or find progressives challenging to adapt to. 

Photochromic lenses contain a special chemical coating that automatically darkens when exposed to ultraviolet light from the sun. These adaptive lenses remain clear indoors but transition to tinted sunglasses outdoors, providing convenience and UV protection without carrying a separate pair of sunglasses. The darkness level adjusts based on UV intensity, functioning even on overcast days. Modern photochromic technology enables quick transitions, darkening in approximately 25 seconds when moving outside and gradually returning to clear when you step indoors.

High-index lenses are thinner and lighter alternatives to standard lenses, specifically engineered for people with strong prescriptions. These lenses have a higher refractive index, meaning they bend light more efficiently and require less material to achieve the same corrective power. Available in different indices (1.6, 1.67, and 1.74), high-index lenses reduce lens thickness, minimize the magnification or minification effect on your eyes, and offer better aesthetics in frames.

Polarised lenses incorporate a specialized filter that blocks 99.9% of horizontal light waves causing glare from reflective surfaces like water, snow, roads, and car hoods. By eliminating this reflected light, polarised lenses dramatically improve visual clarity and reduce eye strain in bright outdoor conditions. These lenses are essential for activities like driving, fishing, skiing, and any outdoor recreation where glare poses challenges. 

Blue light filter lenses feature a special coating designed to block artificial blue light emitted by digital screens, smartphones, tablets, and LED lighting. This coating either absorbs or reflects blue light wavelengths, reducing the amount reaching your eyes. Extended screen exposure can cause digital eye strain, resulting in symptoms like headaches, dry eyes, blurred vision, and fatigue. 

Tinted lenses are colored lenses primarily used in sunglasses to reduce brightness and enhance visual comfort. Different tint colors serve various purposes, grey tints maintain true color perception, brown tints enhance contrast, and green tints provide excellent color balance. Some tinted lenses offer UV protection for eye health, while others are purely cosmetic fashion accessories. 

Anti-fatigue lenses are designed to reduce eye strain from extended near-vision activities and digital device use. These lenses incorporate a subtle boost of magnification power in the lower portion of a single vision lens, providing accommodation relief without the distinct zones found in progressive lenses. 

Occupational lenses are specialized eyewear optimized for specific work environments, particularly office and desk work. These lenses provide enhanced clarity for intermediate distances (computer screens) and near distances (documents and keyboards), offering a wider field of view than standard reading glasses.

Prism lenses are therapeutic prescription lenses that redirect light entering the eyes to correct binocular vision problems. These specialized lenses treat conditions like double vision (diplopia) and eye alignment issues by bending light rays before they reach the retina. This helps the brain properly merge images from both eyes into a single, coherent picture.