This is a home-use WAC (Visual Acuity Corrector) that I purchased about 15 years ago, recommended by the ophthalmologist my child was seeing. Thanks to it, my child's vision improved, and they no longer need glasses, so I am selling it. I took good care of it, so there are almost no scratches or stains. I will also include additional slides and a non-sale slide. The main unit cost 67,000 yen, and the slides cost 9,000 yen. 【Product Features】 Excerpt from HP "Katsuganki OPUS (Opus)" is a home-use eye refreshing device from WOC, incorporating the basic principles of ophthalmology equipment used by ophthalmologists nationwide. It relaxes the eye muscles, which tend to stiffen from overuse, through simple and easy exercises. You can refresh your eyes by simply looking at a beautiful 3D landscape for 5 minutes.