A healthy eye lands a sharp image right on the retina. When the focus falls a little in front or a little behind, the world goes blurry, and the fix is a carefully chosen lens that nudges the image back into place.
In short sight, distant objects focus in front of the retina and are corrected with a concave (diverging) lens. In long sight, near objects focus behind the retina and are corrected with a convex (converging) lens.
Short sight focuses distant objects in front of the retina and is corrected by a concave (diverging) lens; long sight focuses near objects behind the retina and is corrected by a convex (converging) lens.
The correcting lens shifts the focus point back exactly onto the retina.
Switch between a short-sighted and long-sighted eye, then add the correcting lens and watch the image sharpen.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
In short sight (myopia), distant objects are focused...
Short sight is corrected using a...
In long sight, near objects are focused...
Long sight is corrected using a...
Each defect focuses the image in the wrong place, and each is corrected by the opposite type of lens.
| Short sight (myopia) | Long sight (hyperopia) |
|---|---|
| Distant objects focus in front of the retina | Near objects focus behind the retina |
| Cannot see far objects clearly | Cannot see near objects clearly |
| Corrected with a concave (diverging) lens | Corrected with a convex (converging) lens |
| The diverging lens spreads rays before the eye | The converging lens brings rays together sooner |
Short sight is corrected with a concave (diverging) lens, not a converging one, and long sight with a convex (converging) lens. Pairing the defect with the wrong lens is the classic mistake here.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
A person who cannot focus on distant objects (short sight) needs spectacles with a...
A person whose eye focuses near objects behind the retina has...
A converging (convex) lens is used to correct...
Sight correction mastered. Dispersion finishes the light strand.