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. The refraction of the eye; including a complete treatise on ophthalmometry; . corneal astigmatism ; Asthenopia ;Relief with glasses. — November 29, 1895, M. L. H., agedtwenty-five years, in good health, is a designer of wall papers,which occupation requires very acute vision. The patient com-plains that for the last two months her eyes have ached andpained her, and also that her head ached if she persisted inusing her eyes for an hour or two at her work. Ophthalmometer.—Astigmatism with the rule, ID., axis90°-f- or 180°— right eye ; no corneal astigmatism left eye. Fig. 62. — Showing myopic Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-refraction-of-the-eye-including-a-complete-treatise-on-ophthalmometry-corneal-astigmatism-asthenopia-relief-with-glasses-november-29-1895-m-l-h-agedtwenty-five-years-in-good-health-is-a-designer-of-wall-paperswhich-occupation-requires-very-acute-vision-the-patient-com-plains-that-for-the-last-two-months-her-eyes-have-ached-andpained-her-and-also-that-her-head-ached-if-she-persisted-inusing-her-eyes-for-an-hour-or-two-at-her-work-ophthalmometerastigmatism-with-the-rule-id-axis90-f-or-180-right-eye-no-corneal-astigmatism-left-eye-fig-62-showing-myopic-image372229239.html
RM2CHGE5B–. The refraction of the eye; including a complete treatise on ophthalmometry; . corneal astigmatism ; Asthenopia ;Relief with glasses. — November 29, 1895, M. L. H., agedtwenty-five years, in good health, is a designer of wall papers,which occupation requires very acute vision. The patient com-plains that for the last two months her eyes have ached andpained her, and also that her head ached if she persisted inusing her eyes for an hour or two at her work. Ophthalmometer.—Astigmatism with the rule, ID., axis90°-f- or 180°— right eye ; no corneal astigmatism left eye. Fig. 62. — Showing myopic
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RF2JKWTA3–Astigmatic eye (ovoid and non-spherical cornea) inducing distorted vision.
The commoner diseases of the eye : how to detect and how to treat them . ant irritation of thecentral system is responsible for attacks ofchorea, epilepsy, migraine, neurasthenia, nerv-ous indigestion, biliousness, and other dis-orders of the sympathetic system—symptomsthat disappear when proper glasses are worn. Astigmatism and the Ophthalmometer. Corneal astigmatism is measured by an instru-ment called the ophthalmometer, whose efficacydepends upon the variation in the images of ob-jects in the apparatus (mires) cast upon theabnormally shaped cornea. The various posi-tions assumed by these i Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-commoner-diseases-of-the-eye-how-to-detect-and-how-to-treat-them-ant-irritation-of-thecentral-system-is-responsible-for-attacks-ofchorea-epilepsy-migraine-neurasthenia-nerv-ous-indigestion-biliousness-and-other-dis-orders-of-the-sympathetic-systemsymptomsthat-disappear-when-proper-glasses-are-worn-astigmatism-and-the-ophthalmometer-corneal-astigmatism-is-measured-by-an-instru-ment-called-the-ophthalmometer-whose-efficacydepends-upon-the-variation-in-the-images-of-ob-jects-in-the-apparatus-mires-cast-upon-theabnormally-shaped-cornea-the-various-posi-tions-assumed-by-these-i-image338253356.html
RM2AJ8NH0–The commoner diseases of the eye : how to detect and how to treat them . ant irritation of thecentral system is responsible for attacks ofchorea, epilepsy, migraine, neurasthenia, nerv-ous indigestion, biliousness, and other dis-orders of the sympathetic system—symptomsthat disappear when proper glasses are worn. Astigmatism and the Ophthalmometer. Corneal astigmatism is measured by an instru-ment called the ophthalmometer, whose efficacydepends upon the variation in the images of ob-jects in the apparatus (mires) cast upon theabnormally shaped cornea. The various posi-tions assumed by these i
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The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . - .25 D. than its VARIATION IX AXIS OF THE ASTIGMATISM »;;, horizontal meridian. This is demonstrated by the overlappingof the images of the mires bo the extenl of .25 D. when theyare turned from the horizontal to the vertical meridian afterhaying been approximated. But the vertical meridian of theIons is to., little curved by .f> I). It therefore neutralizes the.25 D. of corneal astigmatism (which is with the rule) andleaves still .• !.> I), lenticular astigma Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-refraction-of-the-eye-including-a-complete-treatise-on-opthalmometry-a-clinical-text-book-for-students-and-practitioners-25-d-than-its-variation-ix-axis-of-the-astigmatism-horizontal-meridian-this-is-demonstrated-by-the-overlappingof-the-images-of-the-mires-bo-the-extenl-of-25-d-when-theyare-turned-from-the-horizontal-to-the-vertical-meridian-afterhaying-been-approximated-but-the-vertical-meridian-of-theions-is-to-little-curved-by-fgt-i-it-therefore-neutralizes-the25-d-of-corneal-astigmatism-which-is-with-the-rule-andleaves-still-!gt-i-lenticular-astigma-image339209721.html
RM2AKT9CW–The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . - .25 D. than its VARIATION IX AXIS OF THE ASTIGMATISM »;;, horizontal meridian. This is demonstrated by the overlappingof the images of the mires bo the extenl of .25 D. when theyare turned from the horizontal to the vertical meridian afterhaying been approximated. But the vertical meridian of theIons is to., little curved by .f> I). It therefore neutralizes the.25 D. of corneal astigmatism (which is with the rule) andleaves still .• !.> I), lenticular astigma
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The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . ment can only beapplied to the measurement of the corneal surface in the visual line.As this is the area of the cornea utilized for distinct vision, thisinstrument furnishes all the data practically requisite for the diag-nosis and measurement of corneal astigmatism. The theory of its construction is based on a particular appli-cation of the following well-known optical law: That when twocentered optical systems are so combined that their principal focicoincide, the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-refraction-of-the-eye-including-a-complete-treatise-on-opthalmometry-a-clinical-text-book-for-students-and-practitioners-ment-can-only-beapplied-to-the-measurement-of-the-corneal-surface-in-the-visual-lineas-this-is-the-area-of-the-cornea-utilized-for-distinct-vision-thisinstrument-furnishes-all-the-data-practically-requisite-for-the-diag-nosis-and-measurement-of-corneal-astigmatism-the-theory-of-its-construction-is-based-on-a-particular-appli-cation-of-the-following-well-known-optical-law-that-when-twocentered-optical-systems-are-so-combined-that-their-principal-focicoincide-the-image339182937.html
RM2AKR389–The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . ment can only beapplied to the measurement of the corneal surface in the visual line.As this is the area of the cornea utilized for distinct vision, thisinstrument furnishes all the data practically requisite for the diag-nosis and measurement of corneal astigmatism. The theory of its construction is based on a particular appli-cation of the following well-known optical law: That when twocentered optical systems are so combined that their principal focicoincide, the
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Medical illustration of LASIK and refractive surgery - Translation: Return the flap Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/medical-illustration-of-lasik-and-refractive-surgery-translation-return-the-flap-image478076563.html
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Various possible corrections on an astigmatic eye: spectacle lenses, external lenses. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/various-possible-corrections-on-an-astigmatic-eye-spectacle-lenses-external-lenses-image476925520.html
RF2JKWRA8–Various possible corrections on an astigmatic eye: spectacle lenses, external lenses.
The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . e. Nine months ago he had spherical glassesfitted on account of presbyopia, but they have been unsatis-factory. He consulted me first in February, 1893, when thefoil.)wing condition of affairs was found : — Ophthalmometer.—Shows no corneal astigmatism, that is. theimages of the mires neither overlap nor separate at any positionafter they have once been approximated, and the black linesdividing them into halves remain opposite and straight in allpositions. In such cas Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-refraction-of-the-eye-including-a-complete-treatise-on-opthalmometry-a-clinical-text-book-for-students-and-practitioners-e-nine-months-ago-he-had-spherical-glassesfitted-on-account-of-presbyopia-but-they-have-been-unsatis-factory-he-consulted-me-first-in-february-1893-when-thefoilwing-condition-of-affairs-was-found-ophthalmometershows-no-corneal-astigmatism-that-is-theimages-of-the-mires-neither-overlap-nor-separate-at-any-positionafter-they-have-once-been-approximated-and-the-black-linesdividing-them-into-halves-remain-opposite-and-straight-in-allpositions-in-such-cas-image339210502.html
RM2AKTACP–The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . e. Nine months ago he had spherical glassesfitted on account of presbyopia, but they have been unsatis-factory. He consulted me first in February, 1893, when thefoil.)wing condition of affairs was found : — Ophthalmometer.—Shows no corneal astigmatism, that is. theimages of the mires neither overlap nor separate at any positionafter they have once been approximated, and the black linesdividing them into halves remain opposite and straight in allpositions. In such cas
The levator palpebrae superioris is the muscle in the orbit that elevates the upper eyelid3d illustration Levator palpebrae superioris 3d illustration Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-levator-palpebrae-superioris-is-the-muscle-in-the-orbit-that-elevates-the-upper-eyelid3d-illustration-levator-palpebrae-superioris-3d-illustration-image596571971.html
RF2WJG5HR–The levator palpebrae superioris is the muscle in the orbit that elevates the upper eyelid3d illustration Levator palpebrae superioris 3d illustration
keratoconus disease of the cornea of the eye macro, fatigue corneal thinning. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/keratoconus-disease-of-the-cornea-of-the-eye-macro-fatigue-corneal-thinning-image474730507.html
RF2JG9RGY–keratoconus disease of the cornea of the eye macro, fatigue corneal thinning.
Laser eye surgery procedure vector icon Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-laser-eye-surgery-procedure-vector-icon-140545493.html
RFJ4JB5W–Laser eye surgery procedure vector icon
eye with corneal dystrophy closeup, keratoconus disease thinning of the cornea. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/eye-with-corneal-dystrophy-closeup-keratoconus-disease-thinning-of-the-cornea-image438935048.html
RF2GE363M–eye with corneal dystrophy closeup, keratoconus disease thinning of the cornea.
man with stage 3 keratoconus in the eyes,corneal dystrophy Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/man-with-stage-3-keratoconus-in-the-eyescorneal-dystrophy-image401799483.html
RF2E9KF9F–man with stage 3 keratoconus in the eyes,corneal dystrophy
woman eye closeup with 3 stage of keratoconus, corneal dystrophy. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/woman-eye-closeup-with-3-stage-of-keratoconus-corneal-dystrophy-image435135882.html
RF2G7X476–woman eye closeup with 3 stage of keratoconus, corneal dystrophy.
Medical illustration of LASIK and refractive surgery Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/medical-illustration-of-lasik-and-refractive-surgery-image478075920.html
RF2JNP6M0–Medical illustration of LASIK and refractive surgery
elderly person eyes thinning of the cornea, keratoconus corneal dystrophy closeup. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/elderly-person-eyes-thinning-of-the-cornea-keratoconus-corneal-dystrophy-closeup-image439138862.html
RF2GECE2P–elderly person eyes thinning of the cornea, keratoconus corneal dystrophy closeup.
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc.. peropic eyes are seen, yetstatistics show that fully eighty per cent, of hyperopic eyeshave astigmatism. Astigmatism is located in the cornea or lens, or it may bea condition of both structures in one and the same eye.Astigmatism of the lens may increase, diminish, or neutral-ize the corneal astigmatism. Astigmatism, however, ismore often a condition of the cornea than of the lens. Figure 93 shows parallel rays of light passing throughan astigmatic lens where the vertic Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/refraction-and-how-to-refract-including-sections-on-optics-retinoscopy-the-fitting-of-spectacles-and-eye-glasses-etc-peropic-eyes-are-seen-yetstatistics-show-that-fully-eighty-per-cent-of-hyperopic-eyeshave-astigmatism-astigmatism-is-located-in-the-cornea-or-lens-or-it-may-bea-condition-of-both-structures-in-one-and-the-same-eyeastigmatism-of-the-lens-may-increase-diminish-or-neutral-ize-the-corneal-astigmatism-astigmatism-however-ismore-often-a-condition-of-the-cornea-than-of-the-lens-figure-93-shows-parallel-rays-of-light-passing-throughan-astigmatic-lens-where-the-vertic-image337086096.html
RM2AGBGN4–. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, etc.. peropic eyes are seen, yetstatistics show that fully eighty per cent, of hyperopic eyeshave astigmatism. Astigmatism is located in the cornea or lens, or it may bea condition of both structures in one and the same eye.Astigmatism of the lens may increase, diminish, or neutral-ize the corneal astigmatism. Astigmatism, however, ismore often a condition of the cornea than of the lens. Figure 93 shows parallel rays of light passing throughan astigmatic lens where the vertic
The medial rectus is an adductor, and functions along with the lateral rectus which abducts the eye 3d illustration Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-medial-rectus-is-an-adductor-and-functions-along-with-the-lateral-rectus-which-abducts-the-eye-3d-illustration-image596589479.html
RF2WJGYY3–The medial rectus is an adductor, and functions along with the lateral rectus which abducts the eye 3d illustration
Medical illustration of LASIK and refractive surgery Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/medical-illustration-of-lasik-and-refractive-surgery-image478075981.html
RF2JNP6P5–Medical illustration of LASIK and refractive surgery
an elderly man eye closeup, eye with diagnosed keratoconus corneal thinning. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/an-elderly-man-eye-closeup-eye-with-diagnosed-keratoconus-corneal-thinning-image439138576.html
RF2GECDMG–an elderly man eye closeup, eye with diagnosed keratoconus corneal thinning.
woman eye, diagnosis and treatment of eye problems keratoconus mockup with copy space. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/woman-eye-diagnosis-and-treatment-of-eye-problems-keratoconus-mockup-with-copy-space-image435136325.html
RF2G7X4R1–woman eye, diagnosis and treatment of eye problems keratoconus mockup with copy space.
text keratoconus diagnosis, corneal dystrophy disease. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/text-keratoconus-diagnosis-corneal-dystrophy-disease-image358352298.html
The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . ., butmay be more or less. Sometimes it is only .25 D., or may beabsent. Again, it may amount to .75 D., or 1 D., and excep-tionally to even larger amounts. As a rule, however, it amountsI), or .75 D., and in astigmatism with the rule, it beingof an opposite kind to the corneal astigmatism, it neutralizesto that extent the corneal astigmatism. And that is why wededuct such amount from the reading of the instrument whenthe astigmatism is with the rule. 2. In astigmati Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-refraction-of-the-eye-including-a-complete-treatise-on-opthalmometry-a-clinical-text-book-for-students-and-practitioners-butmay-be-more-or-less-sometimes-it-is-only-25-d-or-may-beabsent-again-it-may-amount-to-75-d-or-1-d-and-excep-tionally-to-even-larger-amounts-as-a-rule-however-it-amountsi-or-75-d-and-in-astigmatism-with-the-rule-it-beingof-an-opposite-kind-to-the-corneal-astigmatism-it-neutralizesto-that-extent-the-corneal-astigmatism-and-that-is-why-wededuct-such-amount-from-the-reading-of-the-instrument-whenthe-astigmatism-is-with-the-rule-2-in-astigmati-image339211914.html
RM2AKTC76–The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . ., butmay be more or less. Sometimes it is only .25 D., or may beabsent. Again, it may amount to .75 D., or 1 D., and excep-tionally to even larger amounts. As a rule, however, it amountsI), or .75 D., and in astigmatism with the rule, it beingof an opposite kind to the corneal astigmatism, it neutralizesto that extent the corneal astigmatism. And that is why wededuct such amount from the reading of the instrument whenthe astigmatism is with the rule. 2. In astigmati
Eye movement pupil constriction3d illustration Trochlear Nerve, Eye movement 3d illustrationThe olfactory tract contains nerve fibers projecting out o Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/eye-movement-pupil-constriction3d-illustration-trochlear-nerve-eye-movement-3d-illustrationthe-olfactory-tract-contains-nerve-fibers-projecting-out-o-image596574135.html
RF2WJG8B3–Eye movement pupil constriction3d illustration Trochlear Nerve, Eye movement 3d illustrationThe olfactory tract contains nerve fibers projecting out o
Laser eye surgery procedure icon. Cartoon illustration of laser vector icon for web design Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-laser-eye-surgery-procedure-icon-cartoon-illustration-of-laser-vector-144112307.html
RFJACTM3–Laser eye surgery procedure icon. Cartoon illustration of laser vector icon for web design
Medical illustration of LASIK and refractive surgery Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/medical-illustration-of-lasik-and-refractive-surgery-image478075849.html
RF2JNP6HD–Medical illustration of LASIK and refractive surgery