21. :Some people wear contact lenses ( with diopters ) with tinted sunglasses ( without dioptres ). 22. In the former, the cylinder power is a number of diopters more convergent than the sphere power. 23. In the latter, the cylinder power is a number of diopters more divergent than the sphere component. 24. A + 1 diopter lens combined with a + 2 diopter lens forms a + 3 diopter system. 25. A + 1 diopter lens combined with a + 2 diopter lens forms a + 3 diopter system. 26. A + 1 diopter lens combined with a + 2 diopter lens forms a + 3 diopter system. 27. For this the standard iron sights can be replaced by target shooting diopter and globe sight sighting lines. 28. Ideally, small wedge prisms are used at 18.5 prism diopters ( Gottlieb, 1988 ). 29. He has big problems with his eyes such as daltonism and extreme myopia (-40 diopter ). 30. Direct comparisons between diopters and the more commonly understood 20 / 20 system of describing poor vision are difficult.
