When a person dies, their muscles, including those controlling the eyelids, relax. This relaxation can lead to the eyelids staying slightly open, giving the impression of death with eyes open. Several factors contribute to this phenomenon.

Physiological Factors: One reason for eyes remaining open at death is the relaxation of muscles. In some cases, the muscles may not have had enough time to relax fully before death, especially in sudden deaths like heart attacks or strokes. Additionally, individuals who are unconscious when they die, such as those in a coma, cannot control their muscles, including those that close the eyelids.

Neurological Considerations: Neurological factors can also play a role. The brain controls muscle movement, including the eyelids. If the brain stops sending signals to close the eyelids before or at the moment of death, they may remain open.

Medical Conditions: Certain medical conditions, such as exophthalmos, can also affect eyelid closure. Exophthalmos, or bulging eyes, can make it difficult for the eyelids to close completely, even after death.

Cultural Beliefs: Cultural beliefs and practices also influence how people perceive eyes open at death. Some cultures view open eyes as a sign of alertness or vigilance even in death, while others see closed eyes as a symbol of peace and finality.

Medical and Forensic Considerations: From a medical and forensic perspective, the position of the eyes at death can provide valuable information. Forensic experts may use the state of the eyes to estimate the time of death or investigate certain causes, such as drug overdoses or trauma.

In conclusion, the phenomenon of eyes open at death is primarily due to the natural relaxation of muscles after death. Factors such as the cause of death, unconsciousness, certain medical conditions, and cultural beliefs all contribute to this phenomenon.