What is a curler?
Eyelash curler — is a specialized cosmetic tool designed for mechanical or thermal curling of hairs and giving them a pronounced curl.
The main function of this tool is to visually "open up" the eyes. It lifts straight or drooping lashes, preparing them for subsequent mascara application.

The classic design features metal tweezers with curved plates. The shape of these plates follows the anatomical curve of the eyelid. Between the metal parts is a soft silicone or rubber pad that protects the hairs from kinks and mechanical damage during compression.
Main types
Metal mechanical curlers are considered the traditional and most common option. To create a curl, they require manual pressure on the handles.

Thermal curlers are electric devices powered by batteries or a built-in rechargeable battery. They heat up to a safe temperature and use the heat to set the curl. These devices work similarly to miniature hair curling irons.

Compact plastic curlers are distinguished by their miniature size and lack of long handles. They are often rectangular in shape and have a folding mechanism, making them convenient for transporting in a travel cosmetic bag.
Corner eye curlers, or mini curlers, feature a narrow working surface. They're designed for pinpointing short lashes in the inner or outer corners of the eyes, areas difficult to reach with standard, wide tools.
How to use
The tool should only be used on clean, dry lashes before applying mascara. This is necessary to prevent the mascara-covered lashes from sticking to the pad, which could lead to breakage or plucking.

The upper metal arm of the curler is placed against the fixed eyelid, as close to the roots of the lashes as possible. After grasping the hairs, gently squeeze the handles for 3-5 seconds. Avoid applying excessive pressure to avoid damaging the lash structure.
To create a smooth and natural curl rather than a sharp angle, the curling process is repeated in three stages. The tool clamps the lashes successively at the roots, then at the mid-lengths, and finally at the tips.
The silicone pad requires regular care. Clean it of makeup residue and sebum after each use. Replace the pad every 3-4 months, as worn or cracked material will no longer protect your lashes from contact with metal.