The camera-type design is the variety of eye morphology which is found in humans, vertebrate animals, spiders, some aquatic creatures and a variety of other complex species. This type of design focuses light onto a photosensitive area or retina at the back of the eye similar to the film of a camera; however, there is some degree of variation between organisms as regards the particular solution they have developed for focusing. In humans, focusing is achieved by varying the shape of the lens to adjust the focal point of light that enters the eye to intersect the retina but not all creatures have this ability, in some aquatic creatures the lens is fixed and water is pumped into the eye to adjust the physical position of the lens relative to the retina. In general, the larger the eye the better the quality of vision which it can produce as increased size allows for an expanded visual field and the resolution is proportional to the number and density of photoreceptors on the organisms retina. See the article entitled "The Human Eye" for a more detailed description.
Disclaimer: The author is not a medical doctor, optician, ophthalmologist or any other medical professional, this article has been compiled using a variety of internet reference sources and while every effort has been made to ensure accuracy this cannot be guaranteed. No preference for product or brand is inferred or intended and the contents of this article are not to be used in whole or in part to inform a decision regarding any aspect of contact lens use.
