Benefits Tinted Anti-Glare Computer Glasses:

• Efficient protection for the eye.
• Significantly reduces the amount of high energy visible (HEV) light.
• Increased contrast and sharper detail.  Your monitor is in focus.
  
  Available in 3 strengths:
  Computer lenses help you focus on objects that are 30" to 36" away (like your computer screen). Your computer screen is out of the range of reading lenses, and it requires a different lens power. Your computer lens power is approximately one-half of your reading lens power. For example, if your reading lenses have a strength of +3.00, your computer lens power will be strong (+1.50). Although you do not need a prescription for computer glasses, it is always a good idea to ask your eye doctor to measure for the correct power.
  
  Note: For anti-glare protection without magnification Melavision

• If your current reading glasses strength is +1.50 to +2.0 select Weak(+1.0).
• If your current reading glasses strength is +2.50 to +3.00 select Medium(+1.25).
• If your current reading glasses strength is greater than  +3.0 to +3.5 select Strong(+1.5).
  
  NOTE:  The above calculations are based on perfect distance visision.  If you wear glasses for disrance or have less than perfect distance vision, this product will not work for you.