An Essay on Vision: Briefly Explaining the Fabric of the Eye, and the Nature of Vision: Intended for the Service of Those Whose Eyes are Weak Or Impaired ; Enabling Them to Form an Accurate Idea of the True State of Their Sight, the Means of Preserving It, Together with Proper Rules for Ascertaining when Spectacles are Necessary, and how to Choose Them Without Injuring SightAuthor, 1792 - 157 pagina's |
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An Essay on Vision,: Briefly Explaining the Fabric of the Eye, and the ... George Adams Volledige weergave - 1789 |
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accuſtomed affiftance alfo alſo anſwer apparatus appear aqueous humour becauſe beſt cafe caſe cauſe choroides circumſtance cloſe colour compaffes concave confiderable confuſed convex convex lens cornea cryſtalline diftinct vifion diftinctly dilated diſeaſe diſorder diſtance Ditto diverging eye Effay electrical eyelids fame fee objects feen fenfible fhade fhew fhort-fighted fide fight fingle firſt fituation fize fmall fome foon fpectacles fquint fuch fufficient furface glaffes glaſs illuftrating impreffion inches increaſe indiftinct Inftruments itſelf leaſt leffen lefs lens leſs long-fighted meaſuring membrane microſcope moſt motion muſcles muſt natural nearer neceffary noſe obfcure obferve occafion opake optic nerve perceive perfon picture preſerve pupil purpoſes quantity of light rays of light reaſon refracted repreſented retina ſame ſclerotica ſee ſeen ſeveral ſhort ſhould ſmall ſome ſpace ſtanding ſtate ſtill ſtrait ſuch ſuppoſed teleſcope thefe theſe thofe thoſe tranfparent uſe uvea viſible vitreous humour whofe whoſe