The Illustrated Optical Manual, Or Handbook of Instructions for the Guidance of Surgeons in Testing Quality and Range of Vision, and in Distinguishing and Dealing with Optical Defects in General |
From inside the book
Results 1-5 of 18
Page 49
... meridian of the eye . It may be conveniently employed in the diagnosis of astigmatism . Stenopaic Holder . — An appliance provided with a stenopoeic slit , so arranged as to be capable of being lessened or increased in width , and ...
... meridian of the eye . It may be conveniently employed in the diagnosis of astigmatism . Stenopaic Holder . — An appliance provided with a stenopoeic slit , so arranged as to be capable of being lessened or increased in width , and ...
Page 83
... meridian , while it is Hc . in the other . Occasionally the refractive quality will vary in one and the same meridian of the eye to such an extent as seriously to interfere with clearness of view . The term regular astigmatism is ...
... meridian , while it is Hc . in the other . Occasionally the refractive quality will vary in one and the same meridian of the eye to such an extent as seriously to interfere with clearness of view . The term regular astigmatism is ...
Page 84
... meridian of greater curvature does not pre- cisely correspond with the median vertical line but intersects it at an angle of about 15 ° , passing from the centre respectively upwards A B S490756045 45 3015 3 h 60 3 15304560 453025 ...
... meridian of greater curvature does not pre- cisely correspond with the median vertical line but intersects it at an angle of about 15 ° , passing from the centre respectively upwards A B S490756045 45 3015 3 h 60 3 15304560 453025 ...
Page 87
... meridian and then in the other , often in rapid succes- sion , so that asthenopia is induced , and adds to the ... meridian of greatest curvature being brought to a focus earlier than the rays passing through the opposite meridian ...
... meridian and then in the other , often in rapid succes- sion , so that asthenopia is induced , and adds to the ... meridian of greatest curvature being brought to a focus earlier than the rays passing through the opposite meridian ...
Page 88
... meridian of least refrac- tion will still be in progress , and at this distance a linear image will result with its ... meridian of refracting medium ( astig- matic ) ; hh , horizontal meridian of ditto ; 1 , 2 , 3 , 4 , 5 , 6 ...
... meridian of least refrac- tion will still be in progress , and at this distance a linear image will result with its ... meridian of refracting medium ( astig- matic ) ; hh , horizontal meridian of ditto ; 1 , 2 , 3 , 4 , 5 , 6 ...
Other editions - View all
The Illustrated Optical Manual: Or Handbook of Instructions for the Guidance ... T. Longmore No preview available - 2018 |
The Illustrated Optical Manual, Or Handbook of Instructions for the Guidance ... Thomas Longmore, Sir No preview available - 2016 |
Common terms and phrases
accommodation acuteness of vision amblyopia ametropia ametropic amount of Acc appear army asthenopia astigmatic eye astigmatism axis binocular vision bull's-eye cause centre ciliary muscle colour colour-blindness concave lens convex lens cornea correcting lens correction Crown 8vo curvature cylindrical lens defect Diagnosis diffusion dioptric diplopia direction distance distant objects distant point distinct vision emmetropic examination exerted exist eye under observation feet focal fundus glasses inches keratoscopy left eye lenses lessened medical officer meridian Mc military service mirror myope myopic neutralised normal acuteness ocular ophthalmoscopic optic parallel rays patient person placed point of distinct power of Acc practice principal focus principal meridians prism rays of light rays proceeding recruit refractive defect refractive power refractive quality regards rendered retina retinal images rifle right eye seen shadow sight soldier spectacles spherical strabismus surgeon target test-dots tion unfit visual acuteness visual angle visual lines
Popular passages
Page 10 - A System of Surgery, Theoretical and Practical, in Treatises by Various Authors.
Page 14 - TREASURY OF KNOWLEDGE AND LIBRARY OF REFERENCE. Comprising an English Dictionary and Grammar, Universal Gazetteer, Classical Dictionary, Chronology, Law Dictionary, &c.
Page 16 - INDUSTRIAL CHEMISTRY; a Manual for Manufacturers and for Colleges or Technical Schools ; a Translation of PAYEN'S ' Precis de Chimie Industrielle.
Page 17 - Other Worlds than Ours ; The Plurality of Worlds Studied under the Light of Recent Scientific Researches.
Page 15 - Miller. — WORKS BY W. ALLEN MILLER, MD LL.D. THE ELEMENTS OF CHEMISTRY, Theoretical and Practical. Re-edited, with Additions, by H. MACLEOD, FCS 3 vols. 8vo. Part I. CHEMICAL PHYSICS, i6^.
Page 7 - FRS THE SCIENCE AND ART OF SURGERY: Being a Treatise on Surgical Injuries, Diseases, and Operations. With 984 Illustrations.
Page 5 - A General History of Greece from the Earliest Period to the Death of Alexander the Great, with a sketch of the subsequent History to the present time. New Edition. Crown 8vo. Cloth, price 7$. 6d, Tales of Ancient Greece.
Page 4 - RELIGIOUS and MORAL WORKS. An Exposition of the 39 Articles, Historical and Doctrinal. By EH BROWNE, DD Bishop of Winchester.
Page 11 - CRITIQUE OF PRACTICAL REASON, AND OTHER WORKS ON THE THEORY OF ETHICS.
Page 21 - NOTES of a COURSE of SEVEN LECTURES On ELECTRICAL PHENOMENA and THEORIES, delivered at the Royal Institution AD 1870.