California Cosmetology Written ExamEyelash and Eyebrow ServicesMedium
During an eyelash extension application, a technician carefully isolates a single natural lash with a tool before applying the extension. What is the primary purpose of this step?
- ATo remove excess natural oil from the lash
- BTo determine the correct adhesive viscosity to use
- CTo measure the length of the natural lash accurately
- DTo prevent adjacent natural lashes from bonding together
Show answer & explanationAnswer & explanation
Correct answer: D. To prevent adjacent natural lashes from bonding together
Isolation separates one natural lash from surrounding lashes so the extension can be bonded to a single hair. Without proper isolation, adhesive can bond multiple lashes together (called 'stickies'), which causes discomfort, uneven shedding, and can pull out natural lashes prematurely.
Why the other options are wrong
- A. Isolation tools do not remove oils; a lash cleanser is used for that purpose.
- B. Adhesive viscosity is chosen based on humidity and technique, not isolation.
- C. Isolation is unrelated to measuring lash length; length is assessed visually before selecting extensions.
Lash Isolation
The technique of separating a single natural lash from surrounding lashes using a tool before applying an extension.
- Prevents 'stickies' where multiple lashes are glued together
- Protects natural lash health and growth cycle
- Essential for proper, even extension application
Memory trick: One lash, one glue — isolate to avoid the goo.