Premium
THE ASTIGMATIC MODULUS AND ITS AGE‐DEPENDENCE
Author(s) -
Saunders Harold
Publication year - 1984
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1984.tb00358.x
Subject(s) - modulus , materials science , composite material
The question is posed as to why the modulus of the astigmatic vector appears lo be randomly distributed with age. This paper investigates astigmatic population distributions. On the assumption of statistical independence, the expected probabilities arc determined and compared with the observed values. Measures of central location arc examined so as to determine skew distributions. A correlation is sought between the spherical and the astigmatic components of refractive corrections. It is concluded that the modulus is age‐dependent but that the variations that occur across the age groups are smaller than can be measured by clinical routines.