Photochromic reading glasses are a great solution for those who hate constantly switching between reading glasses and sunglasses. Product name: Sports reading glasses Material: TR90 frame resin lens Frame features: flexible and strong, not easily deformed, sturdy hinges, integrated nose pads Lens features: high-definition, transparent, clear, blue light blocking, eye fatigue relief, color-changing lenses, progressive multi-focus. Color: black, red, orange Applicable people: men, women Usage: sports, reading, travel, party, fishing, office, home. Glasses specifications: Lens width: 5.4cm 2.1in Temple length: 14.7cm 5.8.0in bridge: 1.6cm 0.6in Lens height: 3.9cm 1.5in Frame width: 13.8cm 5.4in. packing list Reading glasses x1 Cleaning x1 Glasses case x1 Notice: 1. Our photochromic lenses will change color according to the light conditions. When the light conditions are strong, the color of the lenses will become darker. When the light conditions are weak, the color of the lenses will become darker. 2. Do not use paper towels, towels, clothes or alcohol to clean reading glasses. 3. When the glasses are not in use, please put them in the storage box to avoid unnecessary scratches on the lenses and affect their use.Glasses power: 1.0x (45-49 years old), 1.5x (50-54 years old), 2.0x (55-59 years old), 2.5x (60-64 years old), 3.0x (65-69 years old) , 3.5x (70-74 years old). You can choose according to your needs. Anti-blue light reading glasses can prevent blue light from irritating your eyes, effectively block ultraviolet rays and filter blue light. It can protect your eyes, especially for workers who stare at electronic screens for long periods of time. Sports reading glasses: Use TR90 flexible temples, silicone nose pads, no pressure on the nose, soft and comfortable, not easy to fall off, no pressure to wear, no pinch on the face. More comfortable for exercise and suitable for long-term wear. Progressive multifocal glasses, half magnification at the top, suitable for walking and shopping. The magnification of the middle part is slightly reduced and is used for computer work, watching TV, etc. The bottom of the lens is full magnification for close reading. Photochromic lenses are lenses that darken when exposed to light of a certain wavelength (usually ultraviolet light). When no longer illuminated by this light source, it returns to its original transmittance and becomes clear.