. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. that two white zeros ap-peared at the spherical register in connectionwith +, and again with + A rapidoutward turn of the spherical reel toward thetemporal side to the point of the reappearanceof the two zeros will show +; or, if in-creased power is still desired, a rapid turn willdraw+ into position (Fig. 4). [4] Refraction and Muscular Imbalance Turning the reel inward toward the nasalside will likewise decrease its convex brief, each one of these lenses, showingtheir foci in c
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. that two white zeros ap-peared at the spherical register in connectionwith +, and again with + A rapidoutward turn of the spherical reel toward thetemporal side to the point of the reappearanceof the two zeros will show +; or, if in-creased power is still desired, a rapid turn willdraw+ into position (Fig. 4). [4] Refraction and Muscular Imbalance Turning the reel inward toward the nasalside will likewise decrease its convex brief, each one of these lenses, showingtheir foci in conjunction with the two whitezeros, are signals indicating the rapid increaseor decrease of one and one-quarter continuing to +6D., the next turn auto-matically shows zero (or ^plano), the origi-nal starting point, which is again indicated bythe three white zeros. Through the turn of the single reel—an ex-clusive Ski-optometer feature—all convexspherical lenses have now been attained inquarters up to , practically coveringninety percent of all refraction Fig. 5—With supplementary disk pointer set at -j- 6 Sph., this places an additional + spherical lens at sight opening, extending instruments total convex spherical power to + [5] Refraction and Muscular Imbalance Should still greater power be desired, thesmall pointer at the outer edge of the instru-ment should be set at +6 sphere (Fig. 5).This controls a supplementary disk (Fig. 3c)which places an additional +6D. lens beforethe original range of lenses previously referredto, thus increasing the maximum power to+ 12D. If still greater strength is required,any additional trial case lens may be added, acell being provided for that purpose on theforward plate of the instrument. Operates and Indicates Automatically As previously explained, in using the Ski-optometer, it is only necessary to rememberthat each outward turn of the single reeltoward the temporal side of the patient in-creases t
Size: 1790px × 1395px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidrefractionmu, bookyear1921
