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• Single-vision reading lenses are typically designed to correct just for near vision. 
• Bifocal lenses have a correction for reading on the bottom half of the lens and another for distance on the top.
• Trifocal lenses have three sections: distance, intermediate and near vision. Reed says these can be particularly helpful for people over 50 experiencing reduced depth of focus.
• Progressive lenses have a smooth transition between distance and near focal areas without visible dividing lines. “They deliver a more natural look and a smoother transition between different viewing distances,” adds Reed.

“When generic OTC readers are no longer enough, prescription reading glasses -- also called single-vision readers -- are a great next step. These are custom-made by an eye doctor to correct for astigmatism, unequal prescriptions or other specific vision needs,” says Reed. “For those who need multiple levels of vision correction, there are multifocal lenses.” 

The best lens material

“This depends ...