為了測試雙焦與稜鏡雙焦眼鏡是否能控制兒童近視增加的速度，此臨床測試隨機選取135位每年近視增加-0.50D以上中國兒童，1並隨機分為三組(1)單焦鏡片(2)加入度+1.50D之雙焦鏡片與(3)加入度+1.50D並加入3個BI稜鏡之雙焦鏡片
。
測量以散瞳後電腦驗光之近視度數與超音波測量眼軸長為實驗數據，以6個月間隔測量24個月。
結果(1)單焦鏡片組平均近視增加-1.55D (2)雙焦鏡片組平均近視增加-0.96D (3)雙焦鏡片加入稜鏡組平均近視增加-0.70D。眼軸長增加平均各為0.62mm、0.41mm、0.41mm。結果的差別具有統計上的意義。
Randomized Trial of Effect of Bifocal and Prismatic Bifocal Spectacles on Myopic Progression
Two-Year Results
Arch Ophthalmol. 2010;128(1):12-19. doi:10.1001/archophthalmol.2009.332
Objective To determine whether bifocal and prismatic bifocal spectacles could control myopia in children with high rates of myopic progression.
Methods This was a randomized controlled clinical trial. One hundred thirty-five (73 girls and 62 boys) myopic Chinese Canadian children (myopia of 
1.00 diopters [D]) with myopic progression of at least 0.50 D in the preceding year were randomly assigned to 1 of 3 treatments: (1) single-vision lenses (n = 41), (2) +1.50-D executive bifocals (n = 48), or (3) +1.50-D executive bifocals with a 3–prism diopters base-in prism in the near segment of each lens (n = 46).
1.00 diopters [D]) with myopic progression of at least 0.50 D in the preceding year were randomly assigned to 1 of 3 treatments: (1) single-vision lenses (n = 41), (2) +1.50-D executive bifocals (n = 48), or (3) +1.50-D executive bifocals with a 3–prism diopters base-in prism in the near segment of each lens (n = 46).
Main Outcome Measures Myopic progression measured by an automated refractor under cycloplegia and increase in axial length (secondary) measured by ultrasonography at 6-month intervals for 24 months. Only the data of the right eye were used.
Results Of the 135 children (mean age, 10.29 years [SE, 0.15 years]; mean visual acuity, –3.08 D [SE, 0.10 D]), 131 (97%) completed the trial after 24 months. Myopic progression averaged –1.55 D (SE, 0.12 D) for those who wore single-vision lenses, –0.96 D (SE, 0.09 D) for those who wore bifocals, and –0.70 D (SE, 0.10 D) for those who wore prismatic bifocals. Axial length increased an average of 0.62 mm (SE, 0.04 mm), 0.41 mm (SE, 0.04 mm), and 0.41 mm (SE, 0.05 mm), respectively. The treatment effect of bifocals (0.59 D) and prismatic bifocals (0.85 D) was significant (P < .001) and both bifocal groups had less axial elongation (0.21 mm) than the single-vision lens group (P < .001).
Conclusions Bifocal lenses can moderately slow myopic progression in children with high rates of progression after 24 months.
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