| 41. | The first one features an integral carrying handle with a built-in rear diopter sight and a folding front sight.
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| 42. | High PRA values ( > or = 3.50 diopters ) are considered to be diagnostic of disorders involving accommodative excess.
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| 43. | The actual power, as read by a vertometer or lensometer, might differ by as much as 0.1 diopters.
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| 44. | The diopter is an aperture sight component used to assist the aiming of devices, mainly firearms, airguns, and crossbows.
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| 45. | For example, to change refraction by 4 diopters with an optical zone of 3 mm would require ablation of 12 ?m.
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| 46. | :The diopters given as a lens prescription is the reciprocal of the focal length of the lens, measured in meters.
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| 47. | The archaeological record is full of such devices; simple inclinometers and diopters and sighting tubes extend through to ancient Sumerian times.
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| 48. | You may then need glasses of lower diopter, say-1 / 2 with a small cylindrical correction for optimal viewing.
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| 49. | No patient in the small-incision group had a worsening of astigmatism greater than one diopter, a measure of visual acuity.
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| 50. | The rifle uses a " peep " diopter sight, which is flipped over to reveal the open tritium enhanced rear night sight.
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