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The risk of a cashier taking photos of your credit card with smart glasses is a real concern, primarily due to the discreet nature of these devices. Here are some key points to consider:

1. Discreet Recording: Smart glasses, like Meta's Ray-Ban Stories, can record videos and take photos without drawing much attention. This makes it easier for someone to capture sensitive information without being noticed.

2. Privacy Concerns: The use of smart glasses in public spaces has raised significant privacy issues. Meta's own human rights report acknowledges the challenges of obtaining informed consent from bystanders.

3. Potential for Fraud: If a cashier were to take a photo of your credit card, they could potentially use the captured information for fraudulent activities. This includes making unauthorized purchases or even selling the information on the black market.

To mitigate these risks, consider the following precautions:
- Monitor Your Surroundings: Be aware of your surroundings when using your credit card. If you notice someone wearing smart glasses, be extra cautious.
- Use Contactless Payments: Whenever possible, use contactless payment methods like mobile wallets (e.g., Apple Pay, Google Pay) which do not require you to hand over your card.
- Regularly Check Statements: Regularly monitor your bank and credit card statements for any unauthorized transactions.