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Vision is one of the most important senses of human body. A number of events are involved in forming a clear image. Physiology of vision is a complex process comprising of the following mechanisms. · Incidence of light through an object in eye · Phototransduction i.e. initiation of vision · Transmission and processing of visual sensations · Visual perception Optical System of Human Eye The ocular structures forming the refractive and optical system of eye from anterior to posterior comprises of the following (Fig 1.1): 1. Tear Film 2. Cornea- it allows the light to enter the eyeball 3. Aqueous Humour 4. Lens 5. Vitreous Humour 6. Retina