Charak Samhita
वातादिजाश्चतुर्थे दाहच्छर्द्यङ्गशूलमूर्च्छाद्याः । नीलादीनां तमसश्च दर्शनं पञ्चमे वेगे ॥२०॥
In the fourth stage, because of the vitiation of vayu, etc., the patient suffers from vomiting, burning sensation, pain in the limbs, fainting, etc.; In the fifth stage, the patient suffers from blue-vision, or dark- vision, etc.;
english translation
vAtAdijAzcaturthe dAhacchardyaGgazUlamUrcchAdyAH । nIlAdInAM tamasazca darzanaM paJcame vege ॥20॥
hk transliteration by Sanscript