Google has said that it will not make changes to the privacy policy for its Google Glass product ahead of launch.

The US Congress has called for clarification on some of the wearable device's usage terms, but the web giant has stated by letter that it is unwilling to compromise.

"Use of Google Glass will be governed by the terms of the Google Privacy Policy and no changes to the Google Privacy Policy are planned for Glass," said Google in a statement issued to the Congressional Bi-Partisan Privacy Caucus.

Google Glass, which comes equipped with voice-activated photo and video capabilities, has also encountered opposition from rights groups, with a UK-based campaign calling for it to be banned in public spaces.

However, the search engine firm has moved to allay fears of potential privacy violations by putting the word out that the headset will not feature facial-recognition technology.

Google's refusal to co-operate with the US authorities has been met with an angry response, with one Congressman claiming the firm is underestimating the impact the product will have on society.

"I am disappointed in the responses we received from Google," said Congressman Joe Barton. "There were questions that were not adequately answered and some not answered at all."

The prototype Explorer Edition of Google Glass is currently in the hands of around 1,000 developers worldwide, but consumer models will not be available until 2014.

Watch an introductory video to Google Glass below:

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