A first study of the inheritance of vision and of the relative influence of heredity and environment on sight / by Amy Barrington and Karl Pearson.

  • Barrington, Amy.
Date:
1909
Catalogue details

Licence: In copyright

Credit: A first study of the inheritance of vision and of the relative influence of heredity and environment on sight / by Amy Barrington and Karl Pearson. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    for boys and somewhat greater, 30 to -35, for girls. This is quite a sensible amount and should have some influence on the values of fraternal correlation. If we mav Table XXVL Refraction and Age. Characters Material Method s ? Corneal Refraction Ziirioh (Steiger: Product Moment •17 •16 see our p. 15) Refraction Class Edinburgh Contingency •25 (•I7)* •34 (-28)* )i >) Glasgow (Rowan) )) •27 •3G >> )) London (Thompson) >» •21 •17 accept the values deduced from Steiger's material, the effect of age on corneal refraction is not the sole source of the high value between refraction class and age. It should be noticed, however, that Steiger's material only provides three age groups, one of which is adult. We can arrange our material in two other ways which show less concisely the relationship of age to refraction class. Table XXVII. Mean Age of each Refraction Class. Eefraction Class Edinburgh Glasgow London Boys t Girls t Boys Girls Boys Girls Hypermetropia Hypermetropic Astigmatism Mixed Astigmatism Myopic Astigmatism 10-1 (10-0) 9-6 (9-G) 9^7 (9-7) 9-1 (8-7) 10-7) (ll-l) 10-91 ^ ^ 9^7 (10-2) 9-3 (9-3) 8-9 (8-9) 8-3 (8-7) 10-3) 10-7] ^ ^ 10- 4 11- 4] 11- 3 12- 4 13- 3 10-9. ■ 11-4 10- 0 11 •6) I 11-6 11- 7.1 11-75 jlO-f) 11-0] [ 10-8 10-6J 10-6 111-3 1 11-2) [ 10-9 10-7) 10-S jllO All Children 10-0 (9-9) 9-5 (9-6) 10-9 10-5 10-9? 10-9? The Edinburgh data (see Diagram II) appear here to give the smoothest and most reasonable results, namely the hypermetropic and mixed astigmatic are below the mean age; the myopic are above and the normals at the mean age. Rowan and Thompson's abnormals give the myopic at or above the mean age, but do not indicate decisively that the hypermetropic are below the mean age. To obtain any very definite * The first values are from Tables XX and XXI, and the bracketed values from Tables XX bis and XXI bis. t The figures in brackets are from Tables XX bis and XXI bis, and serve to confirm the other results.