The Photographic art-journal . Short-sightednessarises from a too great convexity of the crys-taline lens, while long-sightedness, anotherimperfection of vision—is caused by wantof sufficient convexity. In the formercase the rays of light converged so much,that they are brought to a focus, beforereaching the retina; as in the latter, therays of light are not converged sufficientlyto bring them to a focus in the retina, butthis focus, or the image of an object isformed at a point beyond. The first defectis corrected by the use of concave eye-glasses, and the last by ti*0e of eon» 372 The Photog
The Photographic art-journal . Short-sightednessarises from a too great convexity of the crys-taline lens, while long-sightedness, anotherimperfection of vision—is caused by wantof sufficient convexity. In the formercase the rays of light converged so much,that they are brought to a focus, beforereaching the retina; as in the latter, therays of light are not converged sufficientlyto bring them to a focus in the retina, butthis focus, or the image of an object isformed at a point beyond. The first defectis corrected by the use of concave eye-glasses, and the last by ti*0e of eon» 372 The Photographic Art-Journal. June vex lens, which accomplish for the eyethat labor, in bending the rays of light,which it is unable to perform itself. The diminution of the impression of theobjects upon the eye is contracted some- what beyond the time at which any objecis actually visible^ as illustrated by the facthat we are enabled to see some secondafter it below the horizon. ( -LIFE OF HENRY FUSELI.* BY A. .is rising fame—his poeticfeeling—his great know-ledge^—and his greater con-fidence—now induced Fu-seli to commence an under-taking worthy of the high-est genius—The Shaks-?peare Gallery. An accidentalconversation at the table of thenephew of Alderman Boydell,started, it is said, the idea ; andWest, and Romney, and Hayley,and Fuseli shared in the honor. To themind of the latter, indeed, such a schemehad been long present; it dawned on hisfancy in Rome, even as he lay on his backmarvelling in the sistine, and he saw inimagination a long and shadowy successionof pictures. Boydell supported the plananxiously and effectually; on receivingi2500 Reynolds entered, though with reluc-tance, into a scheme which consumed timeand required much thought: but Fuselihad no rich commissions in the way—hisheart was with the subject-^in Jbiis ownfancy he had already commenced the work,and the enthusiastic alderman found a moreenthusiastic painter, who made no pre
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectphotogr, bookyear1851
