What is the meaning of "optics" in the quoted sentence?

“If Xi (習近平) is viewed as being soft or letting these satellites orbit out of position, then he loses domestic credibility,” said Perry Link, a professor at University of California, Riverside. “The optics for a domestic audience are very important.”
http://www.wsj.com/articles/china-taiwan-summit-a-high-stakes-gamble-for-xi-jinping-ma-ying-jeou-1446645837

My question:
1.) What is the meaning of "optics" in the quoted sentence?
"optics" 在句中的語意?
2.) How would you translate this sentence into Chinese? (如何用中文表達這句話?)
“The optics for a domestic audience are very important.”

You may give your comment in English or Chinese?
Thx.

更新1:

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What is the meaning of "optics" in the quoted sentence?

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