Report of a study of prevalence of refractive error in Central Government employees.

Lignende værker

• Refraction of the human eye and methods of estimating the refraction, including a section on the fitting of spectacles and eye-glasses, etc
  af: Thorington, James, 1858-1944
  Udgivet: (1916)
• Refraction of the human eye and methods of estimating the refraction, including a section on the fitting of spectacles and eye-glasses, by James Thorington
  af: Thorington, James, 1858-1944
  Udgivet: (1930)
• Lectures on the errors of refraction and their correction with glasses
  af: Valk, Francis
  Udgivet: (1889)
• Refraction of the eye; its diagnosis and the correction of its errors. with a chapter on the use of prisms
  af: Morton, A. Stanford
  Udgivet: (1906)
• Lectures on the errors of refraction and their correction with glasses : delivered at the New York post-graduate medical school, with illustrative cases from practice, both private and clinical
  af: Valk, Francis
  Udgivet: (1895)