What does it mean by short sight and long sight ?

Short sight, also known as myopia, is a common vision condition where a person can see objects up close clearly, but objects in the distance appear blurry. This is typically caused by the eyeball being too long or the cornea being too curved, which causes light to focus in front of the retina instead of directly on it.

Long sight, also known as hyperopia, is a vision condition where a person can see objects in the distance clearly, but objects up close appear blurry. This is typically caused by the eyeball being too short or the cornea being too flat, which causes light to focus behind the retina instead of directly on it.

Short Sight (Myopia)

- Also known as nearsightedness
- Occurs when the eyeball is elongated or the cornea (clear front part of the eye) is too curved.
- Light entering the eye focuses in front of the retina (the light-sensitive layer at the back of the eye).
- Results in difficulty seeing objects clearly at a distance.

Long Sight (Hyperopia)

- Also known as farsightedness
- Occurs when the eyeball is shortened or the cornea is too flat.
- Light entering the eye focuses behind the retina.
- Results in difficulty seeing objects clearly up close.

Differences between Short Sight and Long Sight

| Feature | Short Sight | Long Sight |
|---|---|---|
| Eyeball shape | Elongated | Shortened |
| Focus point | In front of retina | Behind retina |
| Objects seen clearly | Close objects | Distant objects |
| Symptoms | Squinting, eye strain, headaches | Blurry vision up close |
| Correction methods | Concave lenses (glasses or contact lenses) | Convex lenses |