Time to replace the spherical equivalent with the average paraxial lens power

While for the ApP , the average is the average of orthogonal and oblique paraxial rays, that is, ApP =average orthogonal and oblique paraxial power F¯ApP(orthogonal+oblique), F¯ApP(orthogonal+oblique)=C14+C14+C2−C14, ApP=F¯ApP(orthogonal+oblique)=C14+C24. [...]the ApP is equal to half the SE if calc...

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Bibliographic Details
Published in:BMJ open ophthalmology Vol. 8; no. 1; p. e001340
Main Author: Kaye, Stephen B
Format: Journal Article
Language:English
Published: England BMJ Publishing Group Ltd 01.06.2023
BMJ Publishing Group LTD
BMJ Publishing Group
Subjects:
Approximation
Editorial
Optics and Refraction
Visual acuity
Optics and Refraction
ISSN:2397-3269, 2397-3269
Online Access:Get full text
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Summary:While for the ApP , the average is the average of orthogonal and oblique paraxial rays, that is, ApP =average orthogonal and oblique paraxial power F¯ApP(orthogonal+oblique), F¯ApP(orthogonal+oblique)=C14+C14+C2−C14, ApP=F¯ApP(orthogonal+oblique)=C14+C24. [...]the ApP is equal to half the SE if calculated in cross cylinder form, that is, ApP=SE2. If a refractive error, however, does comprise a true spherical component, then the average of that component is of course the sphere. [...]for a refractive power that contains a sphere, the ApP=Sphere+C4 and the SE=Sphere+C2 and the difference between the ApP and SE is equal to C4 . The ApP as a scalar measure is more inclusive and appears to be associated with better visual acuity than the SE, although further clinical trials are needed particularly in different age groups and conditions.
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ISSN:2397-3269
2397-3269
DOI:10.1136/bmjophth-2023-001340