Because nobody tells you. Opticians are businesses, and they don’t always shout about discounts. Also, the application feels bureaucratic—like filling out a tax form in a foreign language.
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But the NHS has made it simpler. You can even use a HES (HC2 or HC3) certificate if you have a low income. This is a little card that gives you partial help with prescriptions and dental costs too. It’s like a VIP pass for your health expenses.
My neighbour, Mrs. Patel, had one for years without using it. She thought it was a library card. Now she uses it for everything—even her daughter’s first pair of glasses.