The refraction of the eye : a manual for students / by Gustavus Hartridge.

  • Gustavus Hartridge
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: The refraction of the eye : a manual for students / by Gustavus Hartridge. Source: Wellcome Collection.

    50/272 (page 30)
    ligament returns to its former state of tension, and so tiglitens the anterior part of the capsule, flattening the front surface of the lens. Fig. 27. Diagram of lens, coruen, &c. The right half is represented as in a state of accommodation, the left half at rest. A. The anterior chamber, c. The cornea, l. The lens, v. The vitreous humour. I. The iris. m. Ciliary muscle. When the muscle is thus relaxed to its uttermost, the lens has assumed its least convexity, and the eye is then adapted for its far point {punctum remotum) (r). In this condition the eye is spoken of as beiug in a state of complete repose. When the ciliary muscle has contracted as much as it can, the lens has assumed its greatest convexity, and its maximum amount of accommodation is now in force. This point is the nearest for which the eye can accommodate itself, and is called the punctuvi proximum (p). In the emmetropic eye the punctum remotum is situated at infinity. The position of the punctum proximum can be determined in several ways; the ordinary plan is to place in the patient's hand the small test type and note