1. The refraction of the human eye; A critical study of the statistics obtained by examination of the refractions, especially among school children;Randall;Amer. Jour. Med. Sci.,1885
2. The absolute static refraction of the eye;Jackson;Trans. Amer. Ophth. Soc,1889
3. Alteration in the refraction of the eye;Ayres;Amer. Jour. Ophth.,1891
4. Changes occurring in the refraction of corrected ametropic eyes;Zentmayer;Jour. Amer. Med. Assoc.,1911
5. Changes occurring in refraction of ametropic eyes;Zentmayer;Trans. Coll. Phys., Philadelphia,1923