Monolid eyes have no visible crease. The lash line is closer to the brow and the fold is heavier, which changes both the mapping and how much density the eye can carry before it reads closed.
The Structural Difference
Without a crease, the lid covers more of the lash line when the eye is open. Density that sits well on a creased lid disappears entirely here, and fans that point straight up are hidden by the fold. The whole specification has to answer the fold, not the lash line.
Curl Direction
C and CC work because they clear the fold without curling back into it. D curl on a monolid can fold the fan back against the lid, so the tips disappear when the eye opens. Test D before stocking it for this shape.
Mapping
Keep the inner third short at 7-8mm and build outward gradually. Length in the centre is wasted under the fold. The visible result comes from the outer two-thirds, which is where the money should go.
Density Limit
Above 6D the base starts to show along the fold line. The practical ceiling is 5D-6D at 0.05, placed on every anchor. Higher counts read as a solid band rather than lashes.
Buyer Verification
Ask for photographs with the eye open and looking straight ahead, which is how the fold actually behaves. A set that looks full in a downward-looking photo may show nothing in use. Confirm the supplier ships CC consistently, since it carries most of this segment.
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