It was a real eye-opener.

Meaning

The experience was unexpectedly revealing or insightful.

Examples

• John: 'My trip to the Amazon rainforest was truly unforgettable.'<br>
• Alice: '<b>It was a real eye-opener,</b> wasn't it? I bet you learned so much.'
• John: 'I can imagine. <b>It was a real eye-opener</b> for me too.'
• Alice: 'Visiting that remote village completely changed my perspective.'<br>