False eyelashes are prohibited because they fall under the category of hair extensions. Some doctors have mentioned that false eyelashes cause chronic allergies. Wearing the hair of another human being or joining human hair with one's own hair is clearly prohibited in Islam, and is cursed by the Messenger of Allah (God bless him 26 percent, give him peace) in the famous hadith recorded by Bukhari and others. However, according to many classical scholars (including hanafis), it is allowed to wear animal hair (other than pig hair) or synthetic hair, even if the hair was completely tight to one's own hair.
For more information about this, see the answer published earlier on this website entitled “Wigs and Fake Hair”. In the name of Allah, the most gracious, the most merciful. This response was compiled from DaruliftaBirmingham, co, United Kingdom, which is under the supervision of mufti Mohammed Tosir Miah from the United Kingdom. I understand what you're trying to say, but I think eyelashes are part of what makeup artists do and I want to do everything makeup artists do.
However, in my humble opinion, it's best to avoid it, since doctors have said that false eyelashes can cause allergies and eye infections. Some medical experts say that false eyelashes are medically harmful and cause chronic skin and eye allergies and eyelid infections. False eyelashes should not be used with the intention of attracting the attention of men who are not Mahrams or with the intention of deceiving others. However, returning specifically to the case of false eyelashes and eyelash extensions, most of these products are specifically designed for cosmetic and beautification purposes only.
If the sole purpose of using false eyelashes is to use them to arouse or attract people who are not Mahrams, it is not allowed to use them. In the absence of the two above-mentioned intentions, women will be allowed to wear false eyelashes as long as human hair is not involved. FWIW I live in an African country where 40% of the nation is Muslim, and I've seen a lot of Muslim women use eyelashes and, in fact, I've noticed that a very popular aspect in my country among Muslim women is false eyelashes with a lot of eyeliner. For many Muslim women, false eyelashes have become a bit of a controversial topic due to several Islamic norms regarding the nature and use of false eyelashes, or more specifically the hair that adheres to the body.
Sometimes false eyelashes can complete a makeup look, but my mother discovered that eyelashes are prohibited in Islam. I've always wanted to be a makeup artist, but I don't think I can do it now that makeup artists apply eyelashes to their clients. I Googled this and different websites say that false eyelashes are haram and some say that you can only use halal eyelashes. False eyelashes are included in the same heading, because real eyelashes extend with false eyelashes.
In addition, some doctors have mentioned that false eyelashes cause chronic skin and eye allergies, and to eyelid infections, and can cause eyelash loss. It is haraam for a woman to wear false eyelashes because they come under the name of hair extensions, so the Messenger of Allaah (peace and blessings of Allaah be upon him) cursed those who do so.