The commoner diseases of the eye : how to detect and how to treat them . Conical Cornea. of a cone, the result of the intraocular pressureupon thin and weakened corneal tissue. At theapex of the cone is often observed a slightopacity. It is usually seen in young adults, gen-erally of the female sex. If the patient look-straight forward the deformity may be detectedby a side view of the cornea at its temporal COMMONER DISEASES OF THE CORNEA 22J aspect. Placidos disk, or the ophthalmometer,shows a marked distortion of the image indicat-ing a high degree of irregular astigmatism. Thisanomaly is a
The commoner diseases of the eye : how to detect and how to treat them . Conical Cornea. of a cone, the result of the intraocular pressureupon thin and weakened corneal tissue. At theapex of the cone is often observed a slightopacity. It is usually seen in young adults, gen-erally of the female sex. If the patient look-straight forward the deformity may be detectedby a side view of the cornea at its temporal COMMONER DISEASES OF THE CORNEA 22J aspect. Placidos disk, or the ophthalmometer,shows a marked distortion of the image indicat-ing a high degree of irregular astigmatism. Thisanomaly is accompanied by a marked defect invision which is but slightly improved by Reflected Images of Placidos Disk in Keratoconus. Treatment. Cylindrical glasses to some ex-tent increase the visual power, but reduction ofthe cone by the use of the galvanocautery is themost reliable agent. COMMONER DISEASES OF THE IRIS 231 CHAPTER VIII. THE COMMONER DISEASES OF THEIRIS AND CILIARY BODY. Anatomy and physiology.—What produces the color ofthe iris.—The pupil.—The uveal tract.—Acute iritis.—Usually due to rheumatism or syphilis.—Posteriorsynechia?, or adhesions of the iris to the lens.—How to distinguish iritis from conjunctivitis.—Treatment of iritis very satisfactory if given early.—Cyclitis or inflammation of the ciliary body. Anatomy and Physiology.—The iris is a cir-cular, colored curtain suspended in front ofthe crystalline lens and pierced by an openingcalled the pupil. At its periphery it is attachedto the ciliary body. It separates the anteriorfrom the posterior chamber and regulates, bymeans of the expansion and contraction of thepupil, th
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