Preparing for a double-eyelid consultation usually means choosing a shape.
In-line or out-line, maybe semi-out-line: you look up photos and learn the names.
But with these results laid side by side, changing the height shifted the impression more than changing the shape did.
Height is where the line is placed
Double-eyelid surgery creates a fold line in the lid. How far above the lash line that fold sits is the height.
Set low, the line is mostly covered by the lid when the eye is open, there and not there at the same time. It is close to what people call a hidden or inner fold.
Set high, the line shows more and the lid folds over a wider band. How much bigger the eye looks changes along with it.
Shape (in-line versus out-line) is about whether the line meets the lash line at the inner corner or stays separate from it. It is a different axis from height.
Same face, same family of line, only the height changes
The four below start from the same frontal photo. The line family stays the same; only the height moves from low to medium to high.
Switch between them with the buttons. Watching the eye close and open makes it far easier than still photos to see how much of the line shows.
Looking at just the eyes
The three crops below are cut from the same position at the same size. The face's size and position are unchanged, so any difference you see comes from the crease height.
Low

The line runs thin, and much of it is covered by the lid once the eye opens. Without makeup, it may barely be visible at all.
Medium

The line stays visible with the eye open. The eyes look more defined, but the lid does not fold over dramatically.
High

The fold covers a wider band, and of the three results the eyes look the largest. The line is also the most noticeable.
Height moved the needle more than shape did
What stood out in this comparison was the size of the change.
On the same face, the difference from changing only the height was on the same order as the difference between before and after. In this comparison, deciding the height mattered to the result as much as creating the fold at all.
Changing only the line shape (in-line versus out-line), by contrast, produced a smaller difference. The names are distinct, but to the eye, height carried more of the impression.
Of course, this is one person's face. A thicker lid can mute the same height, and a thin lid can make a small difference read large.
What to ask in the consultation
If only the shape name gets decided, height can go unaddressed. In a consultation you can ask:
- For my lid thickness, what height range is reasonable?
- Is the height you are proposing visible without makeup?
- Is there a chance the line grows shallower over time?