New test Charts for the Measurement of Visual Acuity at far and Near Distances
作者： Louise L. Sloan
DOI: 10.1016/0002-9394(59)90626-9
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sci-hub.se 参考文章(3)
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LOUISE L. SLOAN, Measurement of visual acuity; a critical review. Archives of Ophthalmology. ,vol. 45, pp. 704- 725 ,(1951) , 10.1001/ARCHOPHT.1951.01700010719013
Cannon Rl, A survey of the reading and working distance of presbyopes. Illinois medical journal. ,vol. 115, pp. 4- 6 ,(1959)