9. Partes ollo/ FUNCIONAMENTO / ENFERMIDADES

9.4. HIPERMETROPIA

Unha persoa con hipermetropia pode ver ben os obxectos distantes pero non os cercanos. Isto soe ser debido a que o cristalino é moi plano ou o globo ocular é pequeno. Nos dous casos a luz procedente de obxectos próximos é enfocada detrás da retina.

A hipermetropia pode ser correxida con lentes convexas ou converxentes que acercan os raios para que se enfoquen na retina.

https://www.abpischools.org.uk/full-screen-animation/854/853

(HIPERMETROPIA vs MIOPÍA )

  • A long sighted person can focus clearly on objects in the distance but close objects appear blurred. This is usually either because the lens of the eye is too flat even when the ciliary muscles are fully contracted or because the eyeball is particularly short. In both cases the light from the close objects is focused behind the retina.

Long sight can be corrected using a convex or converging lens which brings the rays of light closer together and makes them more parallel. This means that in spite of a thinner lens or shorter eyeball you can bring the light into perfect focus on your retina.