No abstract available
MeSH terms
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Color Perception Tests
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Color Vision / physiology
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Color Vision Defects / chemically induced*
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Color Vision Defects / diagnosis
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Color Vision Defects / physiopathology
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Erectile Dysfunction / drug therapy
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Humans
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Male
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Middle Aged
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Phosphodiesterase 5 Inhibitors / adverse effects*
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Sildenafil Citrate / adverse effects*
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Tadalafil / adverse effects*
Substances
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Phosphodiesterase 5 Inhibitors
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Tadalafil
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Sildenafil Citrate