VideoLive Lectures Optics Concepts Lecture By Timothy Root, MD 19 Share on Facebook Tweet on Twitter This lecture covers some basic optics principles such as refraction, diopters, and common vision problems faced in an eye clinic. This was recorded at the HOPS ophthalmic technician conference in Daytona Beach. Snapshots from this lecture: I explain the evolution/creation of the eye, from the simple pinhole eye of this nautilus, to the more complex lens system that we use today. Pink Floyd’s album cover can tell us a lot about refraction.. This video segment explains lens diopter power, and how lenses can be stacked. How we convert from our prescription to the power-cross and back. This also explains the difference between using “plus cylinder” and “minus cylinder” in our prescriptions. A video demonstrating accomodation, and explaining why children with congenital cataract surgery need bifocals. Demonstrate how blue-blocker sunglasses remove chromatic abberation and improve perceived vision. Understanding underwater vision to better understand the power of the cornea. A great magic trick … Snell’s law being broken.