Purchased new, and barely used. Originally priced around 3,000 yen. Comes with a case. No prescription. The following is the product description from the manufacturer: ↓ Cuts 99.9% of blue light in the 380-510nm range. If you're still in front of your PC at a time when you should be sleeping, or if you're using your smartphone before bed, you're exposing your brain to blue light even during the time it should be resting. This can stimulate the brain and disrupt your body clock. This can lead to a decrease in sleep quality, and if it continues, it can cause poor health. These glasses support those who work on their computers late at night or have trouble sleeping after using their smartphones before bed. Highly recommended for those who use smartphones or computers for 1-2 hours before bed, those who tend to use their smartphones in a dark room, and those who suffer from insomnia due to smartphone or computer use at night! Please refrain from using these glasses when viewing anything other than PC, smartphone, TV, etc. displays, as they may cause eye strain. - Color: Black - Blue light cut rate: 99.9% - Material: PC - Weight: Approximately 18g - Size: Frame width 146mm, Temple length 152mm, Lens width 60mm, Lens height 38mm Thank you for viewing.