As an eyeglass wearer myself, I know that one of the challenges in having a nice headshot is glare/reflection on my glasses; we want photos without glare.
Glare is the product of a law of physics known as ‘The Law of Reflection.’
The Law of Reflection explains that when a ray of light reflects off a surface (such as eyeglasses), the angle of incidence is equal to the angle of reflection. A photographer must manage this angle.
To produce glare-free headshots, I set my studio lights high on their tripods to create a shallow angle of incidence. Every light setup is different base on the size and curvature of the lenses. In the sample on the left, I estimated – from experience – where I thought the lights would be as a starting point. It wasn’t quite right. With a slight adjustment in the angle of the studio strobes – I use two lights for this type of shot – I produced the glare-free image on the right.
Glasses glare need not be an issue in your professional headshot.