Ecosystem A.G.Tansley – The term "ecosystem" first of all coined by A.G. Tansley. According to Tansley – Ecosystem is symbol of function and structure of environment. E.P. Odum – Father of ecosystem ecology. Ecosystem is the basic unit of ecology. Definition – All organism of an area interect with their physical environment and forming a working system called ecosystem. Note : The boundaries of ecosystem are indistinct and have a overlapping character over each other. Ecosystem is the smallest structural and functional unit of nature or environment. It is a self regulatory and self sustaining unit. Ecosystem may be lar...
The first reported surgical removal of a cataract from the eye occurred in Paris in 1748. The advent of topical anesthesia made this procedure more practical. The early techniques involved removing the entire opaque lens in one piece using an incision that went halfway around the circumference of the cornea. During cataract surgery, a patient's cloudy natural cataract lens is removed, either by emulsification in place or by cutting it out. An artificial intraocular lens (IOL) is implanted in its place. Cataract surgery is generally performed by an ophthalmologist in an ambulatory setting at a surgical center or hospital rather than an inpatient setting. Either topical, sub-tenon, peribulbar , or retrobulbar local anesthesia is used, usually causing little or no discomfort to the patient.
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