Purchased new, and used very little. Retail price was around 3,000 yen. Comes with a case. No prescription. The following is the product description from the manufacturer: ↓ This product cuts 99.9% of blue light in the 380-510nm range. When you're still in front of your PC at a time you should be sleeping, or using your smartphone before bed, you're exposed to blue light even when your brain should be resting. This stimulates the brain and can disrupt your body clock. This can lead to a decrease in sleep quality, and if it continues, it can cause poor health. This 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 it 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.