This is the clouding of the crystalline lens of the eye or its capsule. Light then fails to reach to the retina in sufficient quantity to stimulate vision. It causes diminished vision. The victim cannot see normal objects properly. Older people are the main victims of this disease. Surgical operation is the only treatment. When it is ripe for operation, the crystalline lens can be safely removed. The operation is swift, painless and almost always successful. With the opacity gone, usual vision is restored by wearing thick lenses in front of the eye.
Stellar patterns: The 2nd and 12th signs of the zodiac rule over the right and left eyes respectively. The second sign Taurus is ruled by Venus and the 12th sign Pisces is ruled by Jupiter. Therefore, the Venus or Jupiter if posited in the evil houses 6, 8, 12th along with the lagna lord may cause cataract. It is said that the sun governs the right eye and the moon the left eye. So when these two planets are afflicted in the 2nd or 12th house from the ascendant it may give cataract. Of the senses, mercury governs the sight. Mercury, if afflicted in the 2nd or 12th house, may produce this trouble.
Gem therapy: It is said that emerald has the power to improve eyesight and white pearl has the power to restore eyesight. Ruby is the most powerful gem for all sorts of eye troubles but it can be used only during the attack. Its constant use is not desirable, as it is too hot. It is dangerous during summer months. It will be better to use red coral instead of ruby. So use red coral and white pearl. Emerald may be used as an additional gem in acute cases.