The Carl Zeiss Meditec MEL 90 Excimer Laser System is designed for refractive surgery based on the ablation of corneal tissue achieved with a short pulse excimer laser having a wavelength of 193 nanometers. The laser head emits 4 to 7 nanosecond pulses (FWHM nominal pulse duration) with a repetition rate of 500 Hz. The MEL 90 Excimer Laser is a spot-scanning laser that utilizes a Gaussian beam with a 0.7 mm spot diameter.Indications for Use:The MEL 90 is indicated for use in primary Laser-Assisted in situ Keratomileusis (LASIK) treatments for the reduction or elimination of:• Myopia less in magnitude than -10.00 D sphere (in minus-cylinder notation), with and without cylinder up to -4.00 D, when MRSE is less in magnitude than -10.00 D;• Hyperopia up to +4.00 D sphere (in plus-cylinder notation), with and without cylinder up to +3.00 D, when MRSE is up to +5.00 D; and• Mixed astigmatism with cylinder from >1.00 D up to 4.00 D;in patients who are 18 years of age or older with documentation of stable manifest refraction over the past year as demonstrated by a change in MRSE within +/- 0.50 D.
A mains electricity (AC-powered) device assembly in which input energy is used to excite an excimer gas to emit a high-power laser beam intended for corneal ablation (i.e., photorefractive keratectomy) and other ophthalmologic procedures (e.g., surgical creation of a communication between the lacrimal sac and the nasal cavity). It includes a light source and controls/foot-switch, and is typically coupled to a biomicroscope slit lamp or to an indirect ophthalmoscope by a flexible fibreoptic cable. It does not include femtosecond pulsing or fundus imaging technology.