The underwater imaging systems such as underwater camera

video camera

and rang gated system with laser used in water are improtant tools for ocean researching.But the water has very special property for the light in it

such as scattering and attenuating.The circumstance where underwater imaging systems are being used is also very different form in the air.So it is much more difficult to design the lenses used in water compared with on land.To work properly

the lenses of the underwater imaging systems must be designed specially.This paper is main about the design of the lenses of the underwater imaging systems.All the improtant points for designing the lenses of underwater imaging system are mentioned

and an example is given in the last of the paper.