astigmatic dial

a diagram arranged like the face of a watch, used to determine the presence and axis of astigmatism.

Medical dictionary. 2011.

Look at other dictionaries:

  • dial — A clock face or instrument resembling a clock face. [L. dies, day] astigmatic d. a diagram of radiating lines, used to test for astigmatism. * * * di·al (diґəl) [L. dialis daily, from dies day] a circular area with graduations around the… …   Medical dictionary

  • Astigmatism — An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp… …   Wikipedia

  • Astigmatism (eye) — DiseaseDisorder infobox Name = Astigmatism ICD10 = ICD10|H|52|2|h|49 ICD9 = ICD9|367.2 Astigmatism is an optical defect, whereby vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on …   Wikipedia

  • Liste des albums avec une Couronne dans The Penguin Guide to Jazz — Le guide musical The Penguin Guide to Jazz désigne certains albums notables de jazz par une « Couronne » symbolique. Les auteurs de cet ouvrage ont choisi d évaluer la qualité de plusieurs milliers d albums de jazz par un système allant …   Wikipédia en Français

  • optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …   Universalium

  • an- — 1. prefix not, without (anarchy) ({{}}cf. A (1)). Etymology: Gk an 2. assim. form of AD before n. * * * see a II * * * an 1 a prefix occurring before stems beginning with a vowel or h in loanwords from Greek, where it means not, without, lacking… …   Useful english dictionary

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