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Congenital Blindness
Congenital blindness refers to a group of diseases and conditions occurring in childhood or early adolescence of below 16 years old, which, if left untreated, result in blindness or severe visual impairment that are likely to be permanent blindness later in life. Congenital blindness is a hereditary disease and can be cured by gene therapy. Visual loss in children or infant can occur either at the stage of prenatal (during the time of conception or intrauterine period) or postnatal stage (during birth). A variety of causes can promote congenital blindness but the most concern and highest cause of it is a genetic mutation. In general, 60% of congenital blindness cases are contributed from prenatal stage and 40% are contributed from inherited disease. However, most of the congenital blindness cases show that it can be avoidable or preventable with early treatment. Causes Prenatal stage *Premature Birth *Refractive error *Congenital cataract *Retinopathy of prematurity (ROP) *Infect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schematic Diagram Of The Human Eye
A schematic, or schematic diagram, is a designed representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that are not relevant to the key information the schematic is intended to convey, and may include oversimplified elements in order to make this essential meaning easier to grasp, as well as additional organization of the information. For example, a subway map intended for passengers may represent a subway station with a dot. The dot is not intended to resemble the actual station at all but aims to give the viewer information without unnecessary visual clutter. A schematic diagram of a chemical process uses symbols in place of detailed representations of the vessels, piping, valves, pumps, and other equipment that compose the system, thus emphasizing the functions of the individual elements and the interconnections among them and suppresses their physical details. In an electronic circuit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
