Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== Value of Two Horizontal Prisms====== **One prism held over either eye** * Prisms are assumed to be in the opposite directions over each eye (e.g. both base in or base out) * Prisms are in the frontal plane position. {{:frontal_plane_position.jpg?400|frontal plane position}} ===== Calculator ===== [[https://eyefixer.org/value-of-two-horizontal-prisms/|Click Here]] ===== Table ===== ^ Prism Value ^ 10 ^ 12 ^ 14 ^ 16 ^ 18 ^ 20 ^ 25 ^ 30 ^ 35 ^ 40 ^ 45 ^ 50 ^ ^ 10 | 20 | 22 | 24 | 26 | 29 | 31 | 36 | 41 | 47 | 52 | 58 | 63 | ^ 12 | 22 | 24 | 26 | 29 | 31 | 33 | 38 | 44 | 49 | 55 | 60 | 66 | ^ 14 | 24 | 26 | 29 | 31 | 33 | 35 | 40 | 46 | 52 | 57 | 63 | 69 | ^ 16 | 26 | 29 | 31 | 33 | 35 | 37 | 43 | 48 | 54 | 60 | 66 | 72 | ^ 18 | 29 | 31 | 33 | 35 | 37 | 39 | 45 | 51 | 57 | 63 | 69 | 75 | ^ 20 | 31 | 33 | 35 | 37 | 39 | 42 | 47 | 53 | 59 | 65 | 71 | 78 | ^ 25 | 36 | 38 | 40 | 43 | 45 | 47 | 53 | 59 | 66 | 72 | 79 | 86 | ^ 30 | 41 | 44 | 46 | 48 | 51 | 53 | 59 | 66 | 73 | 80 | 87 | 94 | ^ 35 | 47 | 49 | 52 | 54 | 57 | 59 | 66 | 73 | 80 | 87 | 95 | 103 | ^ 40 | 52 | 55 | 57 | 60 | 63 | 65 | 72 | 80 | 87 | 95 | 104 | 113 | ^ 45 | 58 | 60 | 63 | 66 | 69 | 71 | 79 | 87 | 95 | 104 | 113 | 123 | ^ 50 | 63 | 66 | 69 | 72 | 75 | 78 | 86 | 94 | 103 | 113 | 123 | 133 | Adapted From: [[https://1drv.ms/b/c/31d83ae8e55e0542/ES49Ej_-iyJHmmIL8jmZFEgBpwde_sp-n8pyxpMYBiZUOQ?e=uJIX5C |Thompson & Guyton. Ophthalmic Prisms: Measurement Errors and How to Minimize Them. Ophthalmology 1983;90:204-2010]] {{tag>strabismus prism calculator}} strabismus prism calculator