Zeiss OPMI Lumera i Instructions For Use Manual

Safety measures OPMI Lumera iVersion 8.0Page 18 G-30-1720-enExposure time to lightAccording to some publications, the eye should not be exposed to the lightsource longer than a few minutes. In all surgical cases, the retinal exposure timeto light depends on the type and duration of the procedure and possible casecomplications. It is therefore recommended in ophthalmic surgery to keep thelight intensity as low as possible, or to use a device which prevents the light fromentering the patient’s pupil. It is also recommended to make sure that thepatient’s eye is not additionally exposed to the light of surrounding light sources.This problem has been solved by ZEISS by the use of a swing-in retina protectionfilter (blue barrier filter) that can be swung into the microscope’s illuminationbeam path.Brightness setting The brightness control scale of the ZEISS systems has a linear structure withvalues ranging from 5% to 100%. The stipulations of standard DIN EN ISO15004-2:2007 result in maximum radiation exposure times for the differentillumination configurations as specified in the table “Maximum radiationexposure times” (see Page 20).The maximum brightness of the lamps decreases in the course of time asa result of normal wear.Phototoxic risk factors The microscope light source—like any bright light source—may present apotential hazard to the patient’s eye both in the form of immediately visiblethermal damage to the retina as well as phototoxic chemical reactions whichmay lead to photoretinitis. The factors which play an important role indetermining the phototoxic risk are:– Lamp brightness– Spectral distribution of the light (UV and blue light are more dangerousthan longer wavelengths)– Duration of direct exposure– Pupil size– Clarity of ocular media (infants and young children, for example, may beat a higher risk)– Condition of the eye: aphakic and pseudo-aphakic eyes with IOLs ofa material without UV/blue filter are at a higher risk.– Previous exposure to bright light such as retinal photography, especiallywithin the last 24 hours