De praecipius visus symptomatis eorumque causis Physica & Medica contemplatio

it will provoke, rather than loosen and break through by attenuating and dispersing. For this reason, physicians place lethargic, apoplectic, and paralytic people in clear air, thinking that it has no small power for dispersing and attenuating the thick matter deeply impacted in the passages; indeed, it is also proven that by day the tōi enkritikōi discriminating faculty is more vigorous than at night.

LIX.
Therefore, with the peace of such a great man, we deny that the temperament of the brain is primarily and of itself corrupted by light, since the action of correlatives is circumscribed by its own limits, and a sensible object only injures and destroys the sensorium if it is stronger than is just, not the principle of the faculty, except kata sympatheian schetiken by relative sympathy. Thus, the hand numbed by a narcotic drug does not immediately overturn the dynamin power/faculty of the brain, nor does the pain of a nervous part, exciting spasm and delirium, dissolve the whole substance of the principal member equally, unless other causes are added, such as hot, sharp, or malignant vapors, lacerating the temperature with manifest quality.

LX.
We also deny that the obstruction of the optic nerves is caused by the stronger impression of light unless by accident, such as some cold/catarrh being stirred up, which pertains nothing to the present matter. Finally, we deny tōn ekkrisin tōn holōs exatmizontos pneumatos the secretion of the spirit evaporating as a whole, although external light calls forth and consumes the internal spirit, just as extraneous heat despoils the internal one. Yet it is hardly to be conceded that the eyes are left bereft of every safeguard of the faculty, which perhaps could be asserted from the hypothesis of Galen.

LXI.
Moved by these arguments, we thought another cause for the proposed symptom must be sought, namely in the substance of the organ itself