Abstract: Disclosed is an optical fiber-housing metal pipe, comprising a base body of an optical fiber-housing metal pipe, an aluminum layer formed on the surface of the base body, and an oxide layer formed on the aluminum layer, the oxide layer serving to improve the corrosion resistance and wear resistance of the optical fiber-housing metal pipe. Also disclosed is an optical fiber-housing metal pipe comprising a base body of an optical fiber-housing metal pipe, an Al-X alloy layer formed on the surface of the base body, where X is one or two kinds of elements selected from the group consisting of Mn, Ti, Ni, Cr, Nb, Mg, Fe, In and Sn, or an Al-based composite layer containing at least one kind of a material selected from the group consisting of a carbide, an oxide and an organic compound.

Abstract: An effective method for welding corneal and/or scleral tissues. To join the tissues, laser light is applied using a wavelength which enables penetration of the light to a tissue depth of about 0.2-2.0 mm. The wavelength is selected from within one of the following ranges: (1) 1400-1900 nm, or (2) 2100-2400 nm. In epikeratophakia procedures, the wavelength ranges will be 1900-2100 nm or 2400-2650 nm, allowing a tissue penetration depth of about 0.05-0.2 mm. A laser power output value is selected so that the tissue temperature during welding remains at about 44.degree.-60.degree. C. This value is between about 30 mW-1.5 W. The laser light may be applied in the form of a spot-type beam, an elongate beam, or an annular beam. Application of laser light in the foregoing manner enables ocular tissues to be safely and effectively welded, and is useful in corneal transplantation.