Even the involuntary act of blinking can be painful. Diagnosis
Although corneal abrasions may be seen with ophthalmoscopes, slit lamp microscopes provide higher magnification which allow for a more thorough evaluation. To aid in viewing, a fluorescein stain that fills in the corneal defect and glows with a cobalt blue-light is generally instilled first.A careful search should be made for any foreign body, in particular looking under the eyelids. Injury following use of hammers or power-tools should always raise the possibility of a penetrating foreign body into the eye, for which urgent ophthalmology opinion should be sought. Prevention
Prevention is the best method to avoid recurrence of corneal abrasions. Protective eyewear should be worn by people who work with hazardous machinery, metal, wood, or chemicals, as well as those who perform yard work or participate in certain contact sports. The appropriate type of protective eyewear depends on the specific circumstances, but all should provide shielding, good visibility, and a comfortable fit. Some examples include polycarbonate glasses or goggles, plastic safety glasses, face shields, and welding helmets. Specifically, welders should use a helmet with a lens that blocks UV light to avoid UV keratitis. It is important to notice that people with one eye are especially vulnerable to potentially blinding injuries, and should pay special attention to protecting their eyes.
Immersion foot syndromes are a class of foot injury caused by water absorption in the outer layer of skin. There are different subclass names for this condition based on the temperature of the water to which the foot is exposed. These include trench foot, tropical immersion foot, and warm water immersion foot. : 26–7  In one 3-day military study, it was found that submersion in water allowing for a higher skin temperature resulted in worse skin maceration and pain. Causes
Trench foot
Trench foot  is a medical condition caused by prolonged exposure of the feet to damp, unsanitary, and cold conditions. The use of the word trench in the name of this condition is a reference to trench warfare, mainly associated with World War I. Affected feet may become numb, affected by erythrosis (turning red) or cyanosis (turning blue) as a result of poor vascular supply, and feet may begin to have a decaying odour due to the possibility of the early stages of necrosis setting in. As the condition worsens, feet may also begin to swell. Advanced trench foot often involves blisters and open sores, which lead to fungal infections; this is sometimes called tropical ulcer (jungle rot). If left untreated, trench foot usually results in gangrene, which can cause the need for amputation. If trench foot is treated properly, complete recovery is normal, though it is marked by severe short-term pain when feeling returns. As with other cold-related injuries, trench foot leaves those affected more susceptible to it in the future.