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n.1.An instrument for measuring the forms and angles of salts and crystals; a goniometer.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Davies et al., "Tablet app halometer for the assessment of dysphotopsia," Journal of Cataract & Refractive Surgery, vol.
Several instruments have been used including halometers [5] and subjective questionnaires [6, 7].