Renewing Glasses During the Three Weeks

I purchased spare glasses with lenses that darken in the sun for driving and similar activities. Am I allowed to renew them during the Three Weeks? Or should I wait to renew them specifically on Shabbat, even though I have regular glasses that I wear? Or should I wait until one of the days of the Three Weeks?

Shalom and blessings

It is permitted to renew glasses during the Three Weeks. 

A. No blessing of 'Shehecheyanu' is recited over them. 

B. Glasses are considered a medical accessory, not a 'garment'. 

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