Abstract
A psychophysical approach has been designed to measure straylight from intraocular lenses (IOLs) in vitro. This approach uses a clinical straylight meter (C-Quant) and an observer's eye as optical detector. Based on this, we introduced a method for study of straylight-wavelength dependency for IOLs. This dependency can be used to distinguish between 2 types of scattering particles (small and large) as defined by Mie theory. Validation was performed using a turbidity standard and scattering filters. Several IOLs were analyzed to identify potential scattering sources. Large particles were found to predominate in scattering from the studied lenses. This was confirmed by straylight-angular dependency found in these IOLs.
Highlights
A survey on explanted intraocular lenses (IOLs) has shown that optical phenomena is a common reason for IOL exchange [1]
We introduced a method for study of straylight-wavelength dependency for IOLs
Large particles were found to predominate in scattering from the studied lenses. This was confirmed by straylight-angular dependency found in these IOLs
Summary
A survey on explanted intraocular lenses (IOLs) has shown that optical phenomena (e.g. glare) is a common reason for IOL exchange [1]. Nanoglistenings cannot be resolved under a slit lamp or with light microscopy, so Scheimpflug imaging has been used for their assessment [7] This approach measures backward scatter, forward scatter (straylight) is the important type, as it falls onto the retina and causes glare symptoms [9]. A clinical device (C-Quant, Oculus Optikgeräte GmbH) has been introduced to measure in vivo forward scatter of the eye based on a psychophysical approach [10]. This device has shown potential for in vitro evaluation of light scattering by IOLs [11]. If the C-Quant could be adapted for assessment of straylightwavelength dependence, this could be used to assess particle size, as important for functional (forward) scattering effects
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