Thank you all for the fine answers.
Upon some reserach, I found a book on amazon by Ptolemy, translated to english, that I think is worth buying, and that deals with the subject:
http://www.amazon.com/Ptolemys-Theory-V ... 0871698625
I do not know how usefull the content would be to astrology, but my guess is that it is a lot. Anyone has read this book and found it usefull for astrology? Another writer would be Al-Hazen,
http://en.wikipedia.org/wiki/Alhazen, which is famous for an extensive treatise on optics as well, based on Ptolemy and Euclid, if I'm corret.
What triggered my interest in this was my reading through several articles about optics, and the relation of this with angularity and field of vision. Although there is a philosofical basis regarding aspects, I wanted to know how optics could corroborate this, even modern optics. As I'm no math wizard or physicist, I was completely lost

. Still, I find that more could be explored relating the knowledge of optics to aspects, and that would be an interesting subject to discuss and build a even more solid philosofical basis to astrology (that, or I'm completely oblivious to this discussion and need references

).
Also, this caught my attention, on
http://en.wikipedia.org/wiki/Visual_field:
The normal human visual field extends to approximately 60 degrees nasally (toward the nose, or inward) from the vertical meridian in each eye, to 100 degrees temporally (away from the nose, or outwards) from the vertical meridian, and approximately 60 degrees above and 75 below the horizontal meridian. In the United Kingdom, the minimum field requirement for driving is 60 degrees either side of the vertical meridian, and 20 degrees above and below horizontal. The macula corresponds to the central 13 degrees of the visual field; the fovea to the central 3 degrees.
So, has anyone had this kind of curiosity as well? Any further thoughts on the matter?