There is no strength specified, and I am looking to order 2.50's. Is that an option?

Hi CPM,This order option is for the plano Maui Jim, do a search for the reader Maui Jim's in the 2.50 power, you should be able to bring up your options there. Also beware of stores discounting Maui Jim, it isn't allowed by Maui Jim with any of their authorized dealers, so any discounting store is not MJ authorized and they don't buy from Maui Jim so your purchase will hold no warranty privileges. Hope this helpsEJ's SunglassesAuthorized Maui Jim Dealer

Are these the same size as the MJ sport?

Aloha! Each authentic Maui Jim Sunglasses style is only available in one size. Additionally, the MJ Sport is a line of sunglasses we carry that includes the Ho'okipa style. Mahalo!

What size are these? 64 what?

I take a large to extra large hat, depending on brand. And they fit perfectly. And the 64 millimeters (about 2.5 inches). I think this refers to the lens width which doesn't tell you much. Mine are about 5.75 inches at the widest (bow to bow). Very comfortable and flexible.

Will these frames accept presciption lenses

Aloha! The Ho'okipa style is available to order through an authorized optical retailer with prescription lenses. However, we cannot use the non-prescription frame in this process as there is a frame change to compensate for the prescription lenses. Since prescription lenses are considered a medical device, they must be handled through a licensed optician's office. Please visit an authorized Maui Jim Sunglasses optical retailer in your area for additional details about Maui Jim prescription lenses. To find an optician's office in your area, please visit: https://www.mauijim.com/US/en_US/store-finder/position#start Mahalo!