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The Organisation of the Human Body "Even protazoa respond to changes in light intensity, usually moving away from the source of light,”42 Most plants orient their leaves and flowers toward the sun,43 although they have no special light sensitive structures. In most of the higher animals (particularly four-sensed and five-sensed animals ) this light-sensitivity is located in certain cells and is highly developed.44 The human eye 45 is an excellent example of an extremdely sensitive specilized organ for perceiving light.
Some two-sensed protazoa “have "eye spots" which are more sensitive to light ihait the rest of the cell.'46
The eyes of insect (three-sensed and four-sensed animals) are "mosai" eyes, quite dific rent from the camera eyes of vertebrates. “Mosaic eyes are composed of many, sometimes thousands of visual units, each with a small bundle of light sensitive cells and a fixed, immovable lens. Such an eye does not give a single, sharp picture but produces a mosaic to which each unit of the eye contributes a separate image."27
The Human Eye :
The human cyc is like a lentil50 or "a de luxe leica loaded with extremely sensitive colour films'49 It sees the reflected objects on the retina as it is suggested by the statement that “the eyes see the non-touched and non-entered objects."
“The analogy between the human eye, and camera is complete. The eye has a lens which can be focussed for different distances, a diaphragm (ihe iris) which regulates the size of the light opening (the pupil) and a light sensitive retina located at the rear of the eyc, corresponding to the film of the Camera. Next to the retina is a shưet of cells, filled with black pigment which absorbs extra light aut prevents internally reflected light from blurring the image (Cameras are also painted black on the inside). This sheet, called the choroid also contains the blood vessels which nourish the retina."'50
42. Biology, p. 377. 43. "Tatha padmidinām prātaurikasınam/" Şāddarśana Samuccaya, Gunaratna,
Jainam: tam, V. 49 (Tikā), p. 158. 44. TS. 2. 3; Hiology. p. 377. 45. Ibid Pampaņa I, 15, Indriyapada, pathadāra. 46. Biology, p. 377 47. Biology, p. 377 Bees, etc. have mosaic eyes. 48. Masuracamdasamthänasamthie paņņatte /"') 48a, Pannavana, patthadaram. Pannavana, 1.15, 974, p. 238. 49. Biology, p. 377. 50. Biology, p. 371. Panna vaņā, 18. Indriyapada, pathadara.
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