Question

what will happen if one cell is absent in eye??

Answer 1

If any of the rod or cone cells are abent in the eye then there may not be the possibililty of color vision as rod cells enable vision in dim light and cone cells enable vision in bright light.

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Answer 2

There are 3 types of cells in the eye, 
1. Rods
2. Cones
3. Retinal Ganglion Cells (RGCs)

RODS: 
- Very sensitive to light
- Useful in low light or dim light
- Convergent
- Useful for black and white vision

CONES:
- Less sensitive to light
- Useful in normal light situations
- Detect and distinguish between Red, Green, and Blue color
- Nonconvergent 
- Useful for Color Vision 

RGCs:
- RGCs are useful in differentiating contrast detection and are insensitive to background depth

So depending on which of these 3 cells is absent, eye may loose the function corresponding to that. But it may not loose any function at all since there are millions of these cells and are distribute unevenly and thus there may be chance that only very small % is missing. 

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