   225px|thumb|right|sleep mask a blindfold (from middle english blindfellen) is a garment, usually of cloth, tied to one's head to cover the eyes to disable the wearer's sight. it can be worn when the eyes are in a closed state and thus prevents the wearer from opening them . while a properly fitted blindfold prevents sight even if the eyes are open, a poorly made or trick blindfold may let the wearer see around or even through the blindfold. ==applications== blindfolds can be used in various applications: * as a sleep mask: they block out light when sleeping, especially during air travel, or for those who sleep during the day. it is believed that shutting out light allows the user to achieve a deeper level of sleep. they can also provide relief from claustrophobia for magnetic resonance imaging (mri) patients. glaucoma patients should avoid using these. * in children's games, such as pin the tail on the donkey and when hitting a piÃ±ata. * during both martial arts and weight lifting, to encourage reliance on other senses, such as touch or hearing. * as a sensory deprivation tool in meditation, to focus attention on oneself rather than outside imagery. * as a way to keep a kidnapping victim, hostage, prisoner, etc., from being able to identify locations or people. (a hood is a common alternative.) * to cover the eyes of a blind person for health or cosmetic reasons. (since the invention of sunglasses, this is much less common.) * as a prop in magic tricks. one common trick involves a blindfolded performer doing a task that requires vision, such as driving.the news today online edition, of entertainers and blindfolded drivers by atty. cyril regalado (retrieved july 31, 2011) * as an aid to simulate blindness during training of orientation and mobility specialists, so that they develop empathetic understanding of blindness and learn how to rely on their other senses to get to know the environment and move around freely and independently. ===sexology===  sexual blindfold use is common in and outside of the bondage community, one of the initial things recommended for sexual variety. blindfolds (along 
BDSM_equipment Blindness Eyewear Masks Sleep