Choose EnChroma Avalon when your need is a smaller fitover wrap-around frame glasses. It’s size complements its larger cousin Altavista by meeting the needs of a smaller face while it easily covers a pair of prescription glasses. Or, consider Avalon fitover glasses even if you don’t wear a prescription for superior glare reduction and the discomfort of bright light from the top and sides. Combined with Cx3 Sun SP lenses, enjoy clear, vibrant color outdoors; for those with mild, moderate and strong Protan color blindness. Avalon fitover glasses are designed to be conveniently worn over prescription glasses. Wrap-around frame construction is ideal for those with sensitive eyes or medical concerns. To wear over prescription glasses, the total width of the prescription glasses should be 124mm or less (about 4 7/8th inches), and the height of the glasses 38mm or less (1 1/2 inches). Need to quickly check that Avalon will fit over your prescription glasses, download and print the Fitover Sizing Guide. It easily confirms whether the Avalon or Altavista fitover is best for you. To reduce internal reflections between the lenses, glasses that have an anti-reflection coating are recommended. Case included. Frame size: Medium 61-13-123.