A vision problem that happens when light is focussed in front of the retina is

Options

A. farsightedness
B. nearsightedness
C. colour deficiency
D. None of these

Answer

To solve the question regarding the vision problem that occurs when light is focused in front of the retina, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**: The question states that light is focused in front of the retina. This means that the image formed by the eye's lens is not reaching the retina where it should be.

2. **Identifying the Vision Problems**: We need to consider the options given:
- Farsightedness
- Nearsightedness
- Color deficiency
- None of these

3. **Eliminating Incorrect Options**:
- **Color Deficiency**: This condition is related to the absence or malfunction of cone cells in the retina, which affects color perception but does not relate to the focus of light. Therefore, this option can be eliminated.
- **Farsightedness (Hyperopia)**: In this condition, light is focused behind the retina, which is the opposite of what we have in the question. Thus, this option can also be eliminated.

4. **Understanding Nearsightedness (Myopia)**: In nearsightedness, the light rays from distant objects converge too quickly and focus in front of the retina. This means that individuals with nearsightedness can see nearby objects clearly but struggle with distant ones.

5. **Conclusion**: Since the problem states that light is focused in front of the retina, the correct answer is **nearsightedness** (Myopia).

### Final Answer:
The vision problem that happens when light is focused in front of the retina is **nearsightedness**.