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 ...

Dual-focus contact lenses appeared effective in high myopia in teenagers and young adults, according to a study published in ...

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.

Accelerated changes in the spherical equivalent refraction (SER) and axial length were seen but no changes in the lens power ...