Final answer:
The maximum pressure humans can tolerate without discomfort in diving is around 50-75 atm. Diving becomes uncomfortable for humans at pressures around 100-150 atm. Deep divers commonly wear masks to prevent ocular injuries due to pressure differences and to improve vision.
Step-by-step explanation:
Pressure increases with ocean depth in diving, and the maximum pressure that humans can tolerate without discomfort is typically around 50-75 atmospheres (atm). At pressures of around 100-150 atm, diving becomes uncomfortable for humans.
To prevent ocular injuries due to pressure differences, deep divers commonly wear masks, which help keep a layer of air in front of the eyes for normal vision.
The main risk factor for mask squeeze, which is a type of facial barotrauma injury in divers, is the large internal volume of the mask.
Professionals wear masks or goggles underwater primarily to decrease pressure risks to the eyes. These protective gear also help improve vision in low light conditions and avoid irritation from biocides in the water.
Equalizing mask pressure during descent is important to prevent ocular barotrauma and maintain normal vision. As for the depth record for the deepest dive wearing scuba equipment, it is approximately 500 meters.
During deep dives, the sinuses, lungs, inner ear, and circulation are more susceptible to pressure-related injuries compared to the eyeballs.
The main danger during ascent in deep-sea diving is decompression sickness, also known as 'the bends.'
As the pressure changes during deep dives, liquids in the human body, such as blood and tissues, compress and expand accordingly.