Lasers are increasingly used to treat both anterior and posterior conditions of the eye including some of the most common causes of blindness and sight abnormalities. The principle of laser treatment is the same for all conditions, tissue destruction, and so a high quality reliable laser is essential to the operation of any ophthalmic system. The laser’s effect is caused by one of three mechanisms, direct heating of the tissue (photo-thermal effects including photo coagulation), activation of administered compounds that attach to specific tissues (photo-chemical effects), or destruction of tissue by creating localised plasmas that rapidly expand in small areas (photo-ionisation effects). The choice of which mechanism and therefore what power and wavelength is determined by the condition being treated.
The ability of a laser to be focused to a small spatial cross section and its tight wavelength spread allows the operator to treat only the areas required and to choose a wavelength of light that will interact only with the chosen tissue.
Treatment is often administered using a pulsed or modulated beam allowing more accurate and better control over the energy being applied to the tissue. It is therefore important for fine power control of the laser allowing modulation in the tens to hundreds of hertz range, with a reproducible output beam and power specification without problems of overshoot.
The laser therefore needs to be capable of modulation, a high degree of power control and stability, with a range of powers and with a wavelength to match the demands of the system into which it is being integrated. Laser Quantum offers a range of laser suitable for this application in all the above respects.