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INTRAOCULAR LENSES Ill
Intercom Systems
Kelkom Systems Kelkom Staff Vector Systems; Light Message Intercom Systems
Request staff silently Direct staff without knowing where they are Inform staff of changing patient status Inform staff of phone calls and reply silently Know where each doctor is Know which rooms have patients Know which patient to see next Know how many patients await each doctor
Interferometers
Randwal Instrument Company TheiRAS
The IRAS is a white light interferometer that projects an easy to understand acuity target directly onto the macula, independent of any refractive errors or opacities. The target is formed by the interference of white light and emanates from tiny sources of coherent, laser-like energy which are positioned within the patient's pupil. When examining patients with dense opacities, the IRAS requires that only 2% of the laser-like energy pass through the opacity in order to obtain accurate information.
The IRAS is designed with features and test strategies that are useful for pre-operatively detecting "hidden" pathology which may cause "false positive" postoperative results. The IRAS may also be used to assess and plan therapy for CME, uveitis, and amblyopia patients.
The IRAS can be mounted on a slit lamp, or it can be operated via the portable "hand bridge" technique. The IRAs may also be ordered with a glare testing module for evaluating a patient's glare disability prior to cataract extraction. Normal testirig time is under 4 minutes.
Upgrades of existing non-glare IRASes are also available. Literature and clinical studies available Price on request One-year warranty
The IRAS GT The IRAS GT is a combination macular function and glare
tester in one instrument. The unit can be mounted on
a slit lamp, or it can be operated via the portable "hand bridge" technique. Normal testing time is under 4 minutes.
Glare testing has proven utility in assessing patients with relatively good Snellen acuity who are bothered by glare due to cataract, corneal degenerations, radial K, ARMD, contact lenses, or decentered IOLs. By preoperatively evaluating surgical candidates with the IRAS GT, a doctor can assess macular function and the degree to which glare disability affects the patient's vision. With clear media patients who have multiple problems, the IRAS GT can rapidly quantify the loss of vision attributable to each dysfunction.
With current glare testing methodologies, a patient's ability to see the initial acuity target is already limited by an unknown combination of refractive error, pathology, and/or glare disability. The IRAS GT's initial "non-glare impaired" target is projected onto the fovea, independent of any refractive error or opacities. This sinusoidal grating provides a meaningful reference for glare impairment measurements because it is truly "glare free." It is also the same acuity target used to perform the IRAS macular function test.
The IRAS GT functions as follows: Parallel bundles of light emerge from the IRAS and cross in the lens plane near the eye's nodal point. With non-glare impaired patients, the collimated beams are focused to 4 small spots which lie on the retina at a location peripheral to the interferometeric acuity target. Since light from the acuity target and glare sources are spatially separated at the retina, a non-glare impaired patient's ability to see the acuity target will be unaffected by the glare lights. However, if a patient has a cataract or other glare related problem, light form the collimated beams will scatter onto the fovea and reduce the contrast of the acuity target. The amount of glare disability is the difference between a patient's acuity threshold without the glare lights turned on, compared to the threshold with the glare lights turned on.
Literature available Price on request
Intraocular Lenses
Alcon Surgical Products Division Alcon Surgical provides a complete range of intraocular lens styles.
