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This is seen as a small black dot in fundal retro-illumination (figure 5) and a white dot on the posterior capsular surface in direct illumination.
Note that in figure 10 (a), part of the cataract is seen in direct illumination with the cataract appearing white and part is seen in retro-illumination with the cataract appearing black.
Use of these complex wave modes helps to image areas with poor direct illumination and further improves steep-dip and event termination/truncation at salt boundaries.
and perimeter wall washers balance the flatness of the indirect lighting and allow for direct illumination tasks such as reading fine print in an otherwise darkened space.
Saving of direct illumination into the global lighting solutions provided by the photon and irradiance maps.

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