What exactly are progressive reading glasses?

Progressive or "multifocus" reading glasses, are a type of reading glasses designed for people who need correction for presbyopia, an age-related condition that affects near vision.  

Sightline lenses are designed so you can see near objects clearly through the lower part of the lens, for example when reading, but also give you proper magnification in the upper part of the lens for tasks which are slightly further away.

Key Features:

• No lines or bifocal segments: Unlike traditional bifocal or trifocal glasses, progressive lenses have a seamless, gradual transition between different power zones.
• Multiple power zones: Progressive lenses typically have three power zones:
1. Distance zone: For seeing objects across the table or across the room. 
2. Intermediate zone: For seeing objects at arm's length, like computer screens or books.
3. Near zone: For seeing close-up objects, like reading materials or fine print.

Benefits:

• Convenient: No need to switch between different glasses for different tasks.
• Comfortable: Reduces eye strain and fatigue and improves ergonomics at your work desk.  
• Cosmetic appeal: No visible lines or segments.  And no need to wear your glasses down on your nose, or the top of your head. 

Overall, progressive power reading glasses offer a practical and stylish solution for people who need reading glasses.