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yes, I am an Optometrist
The only eyes that can be harmed, from poorly made glasses, are children under the age of 10. The eyes have not fully developed until that point. After that age you have to worry about the potential for headaches, eyestrain and poor night vision. Adults are not harmed by wearing poorly made glasses, it is just they will have the more symptoms.
The harm done by places like clearly contacts and other online retailers is that they often provide refill's of contact lenses, or new glasses, without a valid prescription (ie. older than 2 years). That is the harm that can be done to your eyes as people can avoid their routine eye examinations and have serious eye conditions missed.
Honestly, if someone chooses to buy online that is their right. I just hope that they are maintaining their regular checkup's with their Optometrist. They also have to be aware that they are taking a hit in the Quality with their purchase.
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