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158:. Similarly, the optical power of a single lens is roughly equal to the sum of the powers of each surface. These approximations are commonly used in
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eye has too little power so when the eye is relaxed, light is focused behind the retina. An eye with a refractive power in one
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close together, the optical power of the combined lenses is approximately equal to the sum of the optical powers of each lens:
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eye has too much power so light is focused in front of the retina. This is noted as a minus power. Conversely, a
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Illustration of the relationship between optical power in diopters and focal length in meters.
105:. High optical power corresponds to short focal length. The SI unit for optical power is the
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is the condition in which one eye has a different refractive power than the other eye.
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85:, or other optical system converges or diverges light. It is equal to the
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that is different from the refractive power of the other meridians has
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Degree to which an optical system converges or diverges light
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that has too much or too little refractive power to
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197:. This is also known as a cylindrical power.
129:, its optical power and focal length change.
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121:have positive optical power, while
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109:(m), which is commonly called the
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257:Field Guide to Geometrical Optics
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34:. For the power of light, see
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255:Greivenkamp, John E. (2004).
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77:) is the degree to which a
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30:For magnifying power, see
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259:. SPIE Field Guides vol.
211:Accommodation of the eye
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61:(also referred to as
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263:. SPIE. p. 7.
291:Optical quantities
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127:refractive medium
119:Converging lenses
75:convergence power
16:(Redirected from
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179:refractive error
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132:For two or more
123:diverging lenses
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67:refractive power
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18:Refractive power
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115:(symbol: dpt).
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71:focusing power
63:dioptric power
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59:optical power
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91:focal length
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36:Radiant flux
226:Plate scale
195:astigmatism
134:thin lenses
242:References
236:Vertometer
216:Lens clock
87:reciprocal
221:Lensmeter
187:hyperopic
160:optometry
285:Category
231:Vergence
205:See also
191:meridian
112:dioptre
89:of the
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183:myopic
177:has a
175:retina
83:mirror
55:optics
171:focus
73:, or
265:ISBN
261:FG01
181:. A
99:= 1/
79:lens
38:and
167:eye
165:An
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162:.
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151:P
147:1
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