title: [Contribution on the infraocular optics (author's transl)].
abstract: Experience indicates that a person will have a comfortable vision only if the sizes of the image in both eyes are approximately equal; a tolerance of approximately 5% is acceptable for this. In other words both optical systems, consisting of a spectacle lens, a contact lens, and the eye must have approximately the same focal length. Patients who have one phacic and one aphacic eye will usually possess quite different focal lengths with conventional contact lens correction. However, with the addition of spectacles and of appropriate contact lenses on one or both eyes, the ophthalmologist has at his disposal a new variable. The given formulas and rules of thumb enable him to choose the strength of spectacles-contact lens combinations so that the patient will also have sharp vision in both eyes and regain a comfortable binocular sight. The method is illustrated by examples.
mesh_terms: D003261:Contact Lenses; D005139:Eyeglasses; D006801:Humans; D007908:Lens, Crystalline / Q000502:physiology; D008962:Models, Theoretical; D055095:Optics and Photonics; D012029:Refraction, Ocular
vernacular_title: Beitrag zur augenseitigen Optik