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What is segment height for progressive lenses?  Segment height for progressive lenses refers to the vertical distance from the bottom of your lens to the centre of your pupil.  How do you measure it? To measure your segment height, you need your glasses frames, a ruler and a mirror. Unlike pupillary distance (PD), segment height depends on the glasses frame you're wearing because different frames can have different lens...

Blue ray exists everywhere today As the widespread use of smartphones, tablet devices and computers increases the time we face a screen, more and more people suffer from eyestrain symptoms. One cause of this is believed to be the blue light emitted from the display on such devices. Blue ray will cause diffusion and flickering in the vision The shorter the wavelength, the stronger...

It will be quite easy to select eyeglasses if you are familiar with your face shape. Come here to simply recognize your face shape, and frames we recommended below can be perfect references for you!! An oval face has slightly wider cheekbones with a gentle curved jawline. ✅Almost every kind of eyeglasses frame look perfect on oval faces, and styles below are absolutely the...