Quick answer
Custom eye-patch geometry should connect under-eye fit, array integrity, handling, manufacturability, pouch size and use instructions.
Start from the use area
A crescent patch must fit the intended under-eye or outer-eye zone without encouraging placement too close to the eye. Define dimensions, orientation, margin around the array, backing flexibility and finger handling area before commissioning a custom tool.
Array variables interact
Projection height, base width, tip shape, pitch, density, footprint and total count interact with formula viscosity, filling, drying, demolding and structural strength. Increasing density or height may change process capability and is not automatically superior.
Backing and adhesive decisions
The backing must support handling and contact while fitting the formula and instructions. Depending on design, an adhesive zone or overlay may be evaluated. Edge feel, removability, pouch loading and application pressure should be reviewed together.
Prototype before locking tooling
Where possible, compare a qualified standard geometry with the custom concept. Define what the custom design must improve and what evidence will confirm that improvement. Lock tooling only after key fit and manufacturability questions are answered.
Packaging consequences
Patch contour affects tray, release liner, primary pouch and carton dimensions. A distinctive shape can create brand value but may reduce packing efficiency or increase materials. Model the full pack before approving retail artwork.