The effect of handhold magnifier on reading speed / 眼科

ABSTRACT

Objective To study the effect of using handhold magnifier on reading speed in patients with low vision and normal-sighted people. Design Prospective,control study. Participants Low vision (13 patients)and normal-sighted readers (37 persons) who use handhold magnifiers or the first time. Method Nine-point text was read by normal vision subjects without magnifier and then with two magnifiers with different magnification (+10 D,+20 D) in different eye-to-magnifier distance (10 cm,35 cm). Nine-point text was also read by low vision people with magnifiers. The big printed text under the same magnification without magnifier was also read by low vision group. Reading speed was recorded. Main Outcome Measures Reading speed (words per minute). Result For normal vision subjects,reading speed without magnifier (194.6?45.2 words/min) is faster than that with a 10D magnifier in an eye-to-magnifier distance of 10cm (159.7?44.7 words/min) (P=0.001),and distance of 35cm (162.5?46.7words/min) (P=0.002),respectively. Reading speed without magnifier is also faster than that with a 20D magnifier in an eye-to-magnifier distance of 10cm (150.3?43.3 words/min) (P