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What is the difference between krypton and argon laser photocoagulation ?

What is the difference between krypton and argon laser photocoagulation ?  The krypton red photocoagulator is useful in treatment when the neovascularization is closer than 200 pm but not under the fovea, because of its ability to spare the inner retina by its virtual lack of absorption by haemoglobin (unlike the argon laser). The conventional argon laser has blue and green wavelengths. The green wave-length is absorbed by haemoglobin and thus may damage the retina, whilst the blue wavelength is absorbed by the macular xanthophyll and results in foveal damage.

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