Abstract
Abstract For the visualisation of the intraocular space it is essential to illuminate the inside of the eye. One illumination approach is diaphanoscopy, in which the light of an extraocular source is transmitted through the tissue layers of the eyewall. The transmission properties of these tissues and their irradiation load depend on applied diaphanoscope contact pressure. However, excessive illumination can lead to irreversible photochemical and thermal damage to the retina. In diaphanoscopic illumination, the retina is particularly at risk due to its proximity to the light source. Therefore, the photochemical and thermal retinal hazards, resulting from direct transmitted light through the eyewall, are determined for different applied pressures of the diaphanoscope on the eye (15, 65 and 115 kPa). The study is performed on porcine eyes with different pigmentation. So, the difference in intraocular irradiance, photochemical and thermal hazards, as well as the maximal exposure time is also examined for different pigmentations. For less pigmented eyes the irradiance inside the eye, the photochemical and the thermal hazard are higher than for higher pigmented eyes. The values also become significantly higher for increasing applied pressure with the diaphanoscope but do not exceed given limits in the standard DIN EN ISO 15004-2: 2014.
Highlights
For direct intraocular illumination of the retina during diagnostic procedures, a sufficient bright illumination of the intraocular space is required
3.2 Direct intraocular irradiance depending on the pigmentation of the eye
The examination of the influence of pigmentation on the direct intraocular irradiance revealed that for 15 and 65 kPa the irradiance is higher for less pigmented eyes than for more pigmented eyes, as well as for EA-R and EVIS-R
Summary
For direct intraocular illumination of the retina during diagnostic procedures, a sufficient bright illumination of the intraocular space is required. A fiber connected to a light source is in contact with the sclera and illuminates the intraocular space by transmitting light through the eyewall (see figure 1). The retinal irradiances and occurring hazards during diaphanoscopic illumination through the porcine eyewall, resulting from direct transmitted light, are measured and assessed for different pressures on the eye. Because of their similarity in physiology and anatomy, porcine eyes are a good alternative to human eyes [7] and are employed in this study
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