spherical equivalent

equivalent, spherical

A spherical power whose focal point coincides with the circle of least confusion of a spherocylindrical lens. Hence, the spherical equivalent of a prescription is equal to the algebraic sum of the value of the sphere and half the cylindrical value, i.e. sphere + cylinder/2. Example: the spherical equivalent of the prescription −3 D sphere −2 D cylinder axis 180º is equal to −4 D.
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00 diopters spherical equivalent at the spectacle plane) can be corrected to reduce dependence on glasses or contact lenses.
The FDA approved expansion of ATCI's ongoing trials includes subjects with higher degrees (up to -10 Diopters) of myopia and up to -6 Diopters of astigmatism, for a maximum spherical equivalent correction of -10 Diopters.
The ALLEGRETTO WAVE, manufactured by WaveLight Laser Technologie, AG, was the first refractive laser to receive concurrent approvals for the treatment of myopia up to -12 diopters with astigmatism of up to -6 diopters and hyperopia up to +6 diopters with astigmatism of up to +5 diopters, not exceeding a mean spherical equivalent of +6 diopters.
Cumulative change in spherical equivalent refraction (myopic shift) after 3 years was significantly less in the intervention group than in the control group.
00D or less of myopic spherical equivalent with or without astigmatism, and high myopia, which is >7.
for the correction of myopic astigmatism in adults 21-45 years with spherical equivalent ranging from -3.
All the children had myopia with a spherical equivalent of more than -0.
00 diopters (D) of spherical equivalent of myopia or myopia with astigmatism, with up to -7.
In all cases, the total diameter is larger than the spherical equivalent design to help stability on the eye.
The approval for hyperopia was granted for up to +6 diopters and with astigmatism of up to +5 diopters, not exceeding a mean spherical equivalent of +6 diopters.
0 D at the spectacle plane, with a maximum manifest refraction spherical equivalent (MRSE) of +6.
Alio found better results in patients with mild keratoconus (less than 53 dioptres) and relatively low spherical equivalent whereas with advanced keratoconus and high spherical equivalent, poorer results (:an be anticipated.

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