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Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc.. ing purposes. To use this disc, the patient isplaced with his back to
![Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc.. ment.—TJic IntcrpnpUlary Distance.—Toaccurately measure the distance from the center of onepupil to the Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc.. ment.—TJic IntcrpnpUlary Distance.—Toaccurately measure the distance from the center of onepupil to the](https://c8.alamy.com/comp/2AGB6C5/refraction-and-how-to-refract-including-sections-on-optics-retinoscopy-the-fitting-of-spectacles-and-eye-glasses-etc-menttjic-intcrpnpulary-distancetoaccurately-measure-the-distance-from-the-center-of-onepupil-to-the-center-of-the-other-is-not-always-an-easy-thingto-do-especially-if-the-pupils-are-dilated-hence-it-is-goodpractice-to-measure-this-distance-from-the-inner-side-or-edgeof-one-pupil-to-the-outer-edge-of-the-other-this-measure-first-measurement-289-ment-can-be-made-with-an-ordinary-rule-divided-to-six-teenths-of-an-inch-or-in-millimeters-or-with-a-special-instru-2AGB6C5.jpg)