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Why when I put my index finger real close to my eye, the tip disappears?

If I point my index finger up and bring it close to my eye the tip of my index finger will disappear and I can see double of my finger as well. But the doubled image tip does not disappear. is this normal? I have an astigmatism as well
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thank you doctor.
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711220 tn?1251891127
MEDICAL PROFESSIONAL
Normal.

Dr. O.
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