Classic reading glasses in a transparent plastic case. Reading glasses are designed to correct presbyopia, a natural condition related to aging that affects the eyes' ability to focus on close objects.

• Lenses: Transparent.
• Frame: Plastic, lightweight, and comfortable.
• Design: "half-frame" for easy shifting of gaze from near to far.

The numbering of reading glasses refers to the diopter required to correct near vision. It is expressed in positive degrees (+) and determined by the prescription of the optician or ophthalmologist:

• +0.50 to +1.00: For mild presbyopia or users who are just beginning to have difficulty with near vision.
• +1.25 to +2.00: For moderate presbyopia, usually for ages 45-55 years.
• +2.25 to +3.00: For more advanced presbyopia, usually for ages over 55 years.
• +3.25 and above: For severe cases of presbyopia.

The exact numbering is determined by a refraction test from an optician or ophthalmologist. It may differ between the two eyes (e.g., +1.5 in the right eye, +2.00 in the left).