Pocket Ophthalmic Dictionary: Including Pronunciation, Derivation and Definition of the Words Used in Optometry and Ophthalmology, Together with a Complete Description of the Light Wave Theory, Anatomy of the Eye, Functions, Blood and Nerve Supply of the Different Parts ...1916 - Ophthalmology - 286 pages |
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Common terms and phrases
accommodation ametropia aqueous humor arteries Asthenopia astigmatism atropine Bifocal blood Canal canthus capsule caused choroid ciliary body ciliary muscles color concave condition conjunctiva convergence convex cornea correct crystalline lens curvature curve cylinder D. C. axis deviation dilated dioptries Diplopia disease distance emmetropia emmetropic error of refraction eyeball eyelids fibers focal length focus glands glass hyaloid hypermetropia inches index of refraction Inflammation inner instrument for measuring iris keras lachrymal lacrimal layer lenses ligaments macula lutea membrane meridians meter metron minus mirror motor muscular myopia object ophthalmos ophthalmoscope optic disc optic nerve optical center orbit Palpebral parallel rays pass patient periscopic Pertaining posterior prism pupil rays of light refractive power retina retinoscope right angles sclera sclerotic side skopeo sphenoid sphere spherical strabismus surface suspensory tendon tion tissue trial frame tumor tunic turning veins vessels vision visual vitreous wave
Popular passages
Page 104 - Specific gravity. The ratio of the weight of a body to the weight of an equal volume of water at some standard temperature.
Page 114 - The dictionary said that inertia was a property of matter, by which matter tends, when at rest, to remain so, and, when in motion, to move on in a straight line.
Page 213 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Page 205 - The angle subtended at the center of a circle by an arc equal in length to a radius of the circle.
Page 170 - ... This can be done in. a number of ways but the simplest is by "neutralization." First, we may consider a simple spherical lens: If we look at an object in the distance through the lens and move the lens we note the direction of the apparent movement of the object ; if it moves in a direction opposite to the movement of the lens it is a plus lens; if the object moves in the same direction it is a minus lens. This is easily accounted for when we remember that a spherical lens on section appears...
Page 60 - A right circular cone is often called a cone of revolution, because it can be generated by the revolution of a right-angled triangle about one of its shorter sides.
Page 96 - ... he is looking not only through convex lenses, but also through prisms with their bases outward; when the frames are too narrow he looks through prisms with their bases inward.
Page 58 - Blindness for one or more colors. Due to the absence from the retina of one or two of the three primary substances (according to Hering).
Page 228 - To find diameter of a circle multiply circumference by .31831. To find circumference of a circle multiply diameter by 3.1416. To find area of a circle multiply square of diameter by .7854. To find surface of a ball multiply square of diameter by 3.1416. To find side of an equal square multiply diameter by .8862.
Page 110 - Relative h. is where it is possible to accommodate for a near point, by converging to a point still nearer — in fact, by squinting.