Concave lenses correct myopia by being thin at the centre and thick at the edge. It diverges light rays entering the eye so they focus further back, landing directly on the retina instead of in ...

The system aids in the orthokeratology lens design process by syncing directly with topographers to create precise lens ...

Two common defects of the eyes are myopia (short-sightedness ... Short-sightedness can be corrected by placing a concave lens in front of the eye, as shown in the diagrams below.