Text-book of ophthalmology . de with white objects of varying sizes (see page 121and remarks under Fig. 37).—D.] 116. [Metamorphopsia.—Metamorphopsia is the condition in whichobjects appear distorted. It may be due to defects in the refractive media (astigmatism, especially of theirregular kind)—refractive metamorphopsia—or to displacement of the retinal elements(retinal metamorphopsia). The latter occurs when the retina is lifted up by an exudate(retinit is, chorioiditis) or an underlying liquid or growth (detachment of the retina, tumor 126 TEXT-BOOK OF OPHTHALMOLOGY of the retina or chorioi
Text-book of ophthalmology . de with white objects of varying sizes (see page 121and remarks under Fig. 37).—D.] 116. [Metamorphopsia.—Metamorphopsia is the condition in whichobjects appear distorted. It may be due to defects in the refractive media (astigmatism, especially of theirregular kind)—refractive metamorphopsia—or to displacement of the retinal elements(retinal metamorphopsia). The latter occurs when the retina is lifted up by an exudate(retinit is, chorioiditis) or an underlying liquid or growth (detachment of the retina, tumor 126 TEXT-BOOK OF OPHTHALMOLOGY of the retina or chorioid). If the process is such that the retinal elements are spreadapart, as for instance occurs in a recent chorioiditis or retinitis, an object looked at willlook smaller than it is {micropsia). This is because a retinal image, that would normallyoccupy three retinal elements, now, owing to the distention of the retina, occupies buttwo, and hence affords an impression corresponding to that afforded by an object of only. [Fig. 39.—Retinal Metamorphopsia. A, Micropsia, evidenced by an irregular bowing in of the parallel lines at a, a. Due to some causeproducing distention of the retinal elements (detachment of retina, recent central chorioiditis or reti-nitis). The case depicted was one of central chorioiditis with a positive central scotoma, s, s. Withinthe scotoma the lines are curved in and are distorted. B, metamorphopsia in same case nine yearsafter; positive scotoma still present. C, Macropsia, evidenced by an irregular bowing out of the parallellines, c. Due to any cause producing shrinking of the retinal elements (atrophic chorioiditis, retinitis).The case depicted was one of solar retinitis in the translators practice. D, the distortion and changein hue produced in a line of test-types by the metamorphopsia in this case. The letters are all reallyof the same height and blackness.—D.] two-thirds the actual size of the object looked at. On the other hand, when th
Size: 1967px × 1271px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecteye, booksubjectophth
