Extremely critical.
they protrude from the front of the camera slightly like a fish eye. They provide a wider but slightly distorted image.
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Depends on the type of defect of the eye
No.
to magnify it
A lens is a device that changes the direction of light.
The simple answer, without any further explanation: focus the picture. Just like you'd be blind without the lens at the front of your eye, if the camera had no lens, the picture taken would just be a blur of light and shadow.
The lighting becomes more critical as the camera will not try to adapt or allow for the lighting it is presented with.
It is possible to do so - you will need to contact your optician.
The objective lenses are the optical element that gathers light from the 'object' being observed and they focus the light rays to produce a real image.
They enlarge and put into focus the object on the slide.
replace the natural lens that is removed during cataract surgery