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US008061839B2

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(12) UIllt€d States Patent (10) Patent No.: US 8,061,839 B2 Frisén (45) Date of Patent: Nov. 22, 2011 (54) DEVICE AND METHOD FOR VISION TEST (56) References Cited (75) Inventor: Lars Frisén, GOteborg (SE) U.S. PATENT DOCUMENTS _ 5,640,220 A 6/1997 Vo et al. (73) Ass1gnee: Visumetrics AB,Vastra Frolunda (SE) 5,946,075 A 3/1999 Horn 6,045,515 A 4/2000 Lawton ( * ) Notice: Subject to any disclaimer, the term ofthis 6,890,077 B2 * 5/2005 D_unn .......................... .. 351/224 patent is extended or adjusted under 35 §éIélkII1lZl;tIl*i11ét ““““““ m25305/ U~S~C~ 154(b)by 65 daYS~ 2003/0002014 A1 1/2003 Grant 2003/0028115 A1 2/2003 Thomas (21) Appl. No.: 12/308,226 2003/0053026 A1 3/2003 Roorda

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U.S. Patent Nev. 22,2011 Sheet 2 of3 US 8,061,839 B2

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