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How Lasers Damage the Eyes. Be it an accident or on purpose, staring into a laser pointer can cause some serious damage to your eye. The kind of damage caused (permanent or temporary) is determined on a case by case basis. Damage also depends on how strong the laser is.
entering the eye, is focused on the retina and may produce there an extremely high energy or power density. If the total amount of energy is high enough they can cause thermal damage. One of the main considerations in the retinal hazard (wavelength range of 400 nm to 1400 nm at IEC 60825-1 or 380 nm to 1400 nm at IEC 62471) is the size of the focal spot on the retina - the smaller this becomes, the higher the power/energy density and consequently - the higher the hazard. The smallest focal spot size considered in the updated laser safety standard - the ANSI Z136.1 (2007) Safe Use of Lasers (Ref 1), is 20-30 Î¼m.