Summary
A good visual acuity in different distances not only requires a high resolution of the retina but as well a good function of convergence and accommodation. Whereas convergence can be controlled intentionally in most cases, this cannot be done for accommodation. Our knowledge of accommodation and convergence is based on subjective and objective methods and also on functional anatomic investigations.
Convergence and accommodation are loosely connected with each other. Only deviations from the ideal connection must be corrected by fusion. Each artificial manipulation of this connection between convergence and accommodation is combined with additional effort of fusion. The resting value of accommodation is not the far point but a myopic one. It is determined by the dynamic equilibrium of the sympathetic (desaccommodation) and the parasympathetic (accommodation) nervous system. The resting point drifts towards the far point with increasing age. It is unstable. Recognition rate for small targets does not reach 100%.
Accommodation varies around values which shift towards the resting point with increasing unsharpness of targets. Therefore unsharp targets should be avoided. Accommodation shows chromatic errors like the eye-optics. This error increases with the saturation of colours. Edges of different spectral colours of equal luminance give uncertain values of accommodation. The dynamic amount of accommodation and its velocity decrease at the age of 40 to 55 years. Latency increases. The dynamic values of convergence remain constant.
Very slow variations of target distances result in unremarkable asymmetric responses of convergence and accommodation.
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Krueger, H. (1985). Die Funktion der Akkommodation des menschlichen Auges. In: Bodmann, HW. (eds) Aspekte der Informationsverarbeitung. Fachberichte Messen · Steuern · Regeln, vol 13. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82572-9_2
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