The various methods which have been used to detect changes in the refractive power of the eye due to accommodation are reviewed. An optometer of new design is described which uses infrared energy and therefore possesses the advantage of not acting as a glare source or as a stimulus to accommodation. The instrument has a noise equivalent to about 0.05 diopters when it is adjusted to detect fluctuations of accommodation from 0 to 5 cps. Normal fixation movements of the eye do not interfere with the measurements of refractive power. The optometer as described has been constructed from standard optical components which make it suitable for use in research, but it might readily be modified to suit particular users.
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