Cluster eyelashes are pre-made fans (bulb bases with multiple eyelashes on them). There are a number of disadvantages with them, compared with single eyelash extensions.
- Cluster eyelash extensions are applied to a group of many natural eyelashes at the same time, and those natural eyelashes will be at different stages of growth, and may be growing at different speeds. The resulting tension from the cluster can cause premature lash loss.
- The bases are usually bulky from the adhesive that holds all the lashes on them together. This may cause tension on the real hair follicles.
- The natural lashes become visibly clumped together.
- Because it is a pre-made fan of extensions already held together by glue, when you fix them to the natural lashes that requires more glue. The result is that twice the amount of glue is needed. This makes the base area seem lumpy and heavy.
- A potential problem with too much glue is that it can result in irritation and allergic reactions.
- Because cluster lashes are so wide, they are glued to the eyelid. This is potentially dangerous for the eye and the skin.
Volume lashes are a much better alternative, if you can afford them.
Strip eyelash extensions come on a strip with all the lashes attached. Glue is spread on the strip, which is then fixed to the lash line of the eyelid.
The lashes may be made from synthetic materials but they can even be human hair.
Strip eyelash extensions have the advantage that they are easy to put on and easy to take off again. But they are bound to look artificial compared to individual lash extensions.