31. A different model of toric lenses is created by Alcon and may correct up to 3 diopters of astigmatism. 32. The diopter gave the opportunity for spectacular deep focus-compositions that would have been impossible to achieve otherwise. 33. Concentric circles are also found in diopter sights, a type of mechanic sights commonly found on target rifles. 34. On 28 November 1906, the 5th order diopter lamp was substituted by an optical device of greater range. 35. Two years ago, Azar said, he performed Lasik only on people needing more than 6 diopters of correction. 36. Trifocals are mostly used by people with advanced presbyopia who have been prescribed 2 diopters or more of reading addition. 37. A + 10 diopter lens, which has a focal length of 10 centimeters, would make a good magnifying glass. 38. The non-aiming eye can be blocked from seeing distractions by mounting a semi-transparent occluder to the diopter . 39. The small diopter viewing opening ensures the shooter's eye is very precisely and consistently centered behind the diopter sight. 40. The small diopter viewing opening ensures the shooter's eye is very precisely and consistently centered behind the diopter sight.
