Ka taea e te arotahi tiaki miihini tapahi taiaho te tiaki i te ara iahiko o roto me nga waahanga matua o te upoko tapahi laser. Ko te take o te mura o te mata whakamarumaru o te miihini tapahi taiaho he kore e tika te tiaki me te otinga ko te kowhiri i tetahi whakamatao ahumahi e tika ana mo te wera o to taputapu laser.