Defective ocular movements and their diagnosis / by E. and M. Landolt ; translated by Alfred Roemmele and Elmore W. Brewerton.

  • Landolt, E. (Edmond), 1846-1926.
Date:
1913
Catalogue details

Licence: In copyright

Credit: Defective ocular movements and their diagnosis / by E. and M. Landolt ; translated by Alfred Roemmele and Elmore W. Brewerton. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    In hypermetropic eyes, which are short, the centre of rotation is situated relatively further back; in myopic eyes, which are long, further forward. In looking upwards the centre of rotation recedes slightly, in lowering the eyes it advances slightly (Helmholtz). By optical axis'' (AA, Fig. 4) is meant the axis of the dioptric system of the eye. It comprises the cardinal points, and passes not far from the centre of rotation and practi- cally through that of the cornea (C) (Helmholtz). Theline of v is ion is the straight ray which falls on the fovea from the fixed point. The anterior part of this line goes from the fixed point O to the first nodal point K; the pos- terior part from the second nodal point K to the fovea (F) (Helmholtz). If the two nodal points are considered as coinciding, the straight line that passes through this point from the point of fix- ation to the centre of the fovea is'called the line of direction. Fig.