Frame size is determined by the three key measurements found inside the frame arm: lens width (from 31-60mm), bridge width (from 12-31mm), and arm length (from 115-155mm).
Your lens height (mm)
39
Lens height is essential for multifocal prescriptions, such as Progressives, which require a minimum measurement of 28-30mm. They are also recommended for Rx sunglasses.
The subtle upswept rectangular design of the Mainstay FNDTN019 frame is perfect for medium oval and heart-shaped faces, following the natural brow line and defining the eyes. The gently upturned temples are a good fit for wider foreheads, while its thinner base suits softer features. Adjustable silicone nose pads, flexible plastic arms and spring hinges ensure all-day comfort.
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