What should I do? Adjust my 19-inch monitor or change to a 17-inch? Are there any theories about the optimal size monitor for human eyes?

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logo Why do my eyes feel more easily tired when using a 19 inch LCD monitor than a 17 inch one?
Dell UltraSharp 1907FP 19 inch Flat Panel Monitor
Dell UltraSharp 1907FP 19 inch Flat Panel Monitor
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Samsung SyncMaster 941BW 19 Widescreen LCD Monitor Black
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HP W1907 19 Widescreen LCD Monitor Silver
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Dell 1907FPC 19 LCD Monitor 1280 x 1024 Warranty 30 days
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Dell UltraSharp 1908FP Black 19 inch Flat Panel Monitor
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Dell 1907FPC Flat TFT Panel LCD Monitor |19 Inch | Active Matrix 7001 CCFL 4
Dell 1907FPC Flat TFT Panel LCD Monitor |19 Inch | Active Matrix 7001 CCFL 4
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