Short answer: a catchlight is the reflection of the light source in your eye, the small bright shape you see in every good portrait. Eyes without a catchlight look flat and a little lifeless, even when everything else about the photo is right. With one, the same face looks alert and engaged. When I review frames during a headshot session, the catchlights are one of the first things I check.
The front of the eye is curved and glossy, so it reflects whatever is bright in front of you, the same way a car hood reflects the sky. In a portrait studio that bright thing is my softbox, so the catchlight takes the softbox's shape. A round modifier draws a round catchlight, a rectangular softbox draws a rectangle, and a window draws a window. Nothing is added in editing, it is honest optics, captured in the moment.
Where the catchlight sits in the eye changes how the face reads. Photographers often borrow the clock face idea: a catchlight around the 10 or 2 o'clock position tends to look natural and lively, because that mimics where the sun or a window would usually be. A catchlight dead center low in the eye can look odd without anyone knowing why. These are tiny adjustments, moving a light a few inches, but expressions are tiny things too.
Every light near the front of the subject can add its own reflection, so a careless setup can leave eyes full of competing bright shapes. I arrange the key light to own the catchlight and keep other lights behind or off to the side where they do not show up in the eyes. The result is one clean sparkle per eye, which is a quiet part of why professional headshots look calm and confident instead of busy.
Often, yes. The catchlight is a tiny mirror image of the light source, so its shape gives away whether the photographer used a round softbox, a rectangular one, an umbrella or a window. Photographers read them the way mechanics read engine sounds.
Usually it just means two lights were close to the camera axis, which can look a little busy. I position lights so one clean catchlight does the job, unless a second one is there on purpose.
They matter more, not less. At thumbnail size the face is mostly eyes and expression, and a bright catchlight is what makes the eyes register as alive at a glance.
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