The lower lens unit in schizochroal trilobite eyes reduces reflectivity: On the possible optical function of the intralensar bowl

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Abstract
It is shown that the lower lens unit (or intralensar bowl) in the corneal doublet lens of schizochroaleyed trilobites decreases reflectivity. The reflectivity of geometric optically equivalent distally and proximally Huygensian (spherically corrected) singlet lenses is calculated and compared with the reflectivity of the aplanatic doublet lens in the trilobite Crozonaspis struvei. The maximum reflectivity reduction by the intralensar bowl in the doublet lens amounts to 10.5% and 3% by comparison with the corresponding distally and proximally Huygensian singlet lenses, respectively. From this it is concluded that one of the possible functions of the intralensar bowl might be reflectivity reduction and transmissivity enhancement.

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