. A treatise on diseases of the eye . on. Intense light from snow and from the electric arclight produces irritation and intense ph()toj)h()bia, because of destructionof the superficial conjunctival and corneal epithelial cells, due to theaction of the ultraviolet light waves (Widmark). The bites of insects connnonly occur on the lids, and the aiiectionof the conjunctiva, which sometimes becomes greatly edematous, isdue to extension of the poison. LAR VA L CON J UNCTI ] 7 TIS 253 Treatment.— All of these forms of conjuiu-tival irritation subside in afew days if the cause is removed and simple
. A treatise on diseases of the eye . on. Intense light from snow and from the electric arclight produces irritation and intense ph()toj)h()bia, because of destructionof the superficial conjunctival and corneal epithelial cells, due to theaction of the ultraviolet light waves (Widmark). The bites of insects connnonly occur on the lids, and the aiiectionof the conjunctiva, which sometimes becomes greatly edematous, isdue to extension of the poison. LAR VA L CON J UNCTI ] 7 TIS 253 Treatment.— All of these forms of conjuiu-tival irritation subside in afew days if the cause is removed and simple cleanliness observed. Ophthalmia Nodosa (Saemisch).—The presence of caterpillar hairson the conjunctiva produces a nodular inflammation of the con-junctiva (ophtlialmia nodosa), which may extend to the cornea, andeven to the iris. The nodules are yellowish, semitranslucent, and havebeen compared to tubercles. On excising such nodules and examiningthem under the microscope, Pagenstecher found the hairs of the caterpillar. Fig. 152. Section through a nodule in ophthalmia nodosa. In the centre, surrounded by leukocytes, thecross-section of a hair is shown. A zone of giant cells and epithelioid cells surrounds them. (Graefeand Saemisch.) Hop Pickers Conjunctivitis.—Women and children employed in})icking h()])s are, according to Adams,^ subject to a form of acuteconjunctivitis, sometimes accompanied by keratitis and hypopyon,due to the hairs of the l)racts and katkins of the plant. Cocaine Conjunctivitis.—Cocaine, when used in the conjunctiva,produces at first a contraction of the })lood-vesseLs; l)ut, as its eiiectM^ears away, there is an engorgement of the vessels, which stimulatesand irritates the conjunctiva, producing a mild form of conjunctivitisif long-continued. The addition of cocaine to coUyria that are to beused for some flays or weeks is not advisable on this accoimt. Tea-leaf Conjunctivitis.—A poultice of tea leaves is thought bymany of the laity to be of l)en
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteyediseases, bookyear
