Uchiha Sharingan System.

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Sharingan partially activated - One Tomoe-word cost 250 un mastered,500 words mastered

This is the first variation of a partially developed Sharingan eye. The clan members pupil will turn red and develop one of the wheel swirls. When Uchiha Sasuke finally activated his Sharingan, his left eye took this form.

Sharingan partially activated - Two Tomoe- word cost 1,000 un mastered,1,500 mastered

This is the second variation of a partially developed Sharingan eye. The clan members pupil will turn red and develop two of the wheel swirls. When Uchiha Sasuke finally activated his Sharingan, his right eye took this form.

Sharingan fully activated - Three Tomoe-word cost 2,000 un mastered, 2,500 mastered

This is the final normal form of the Sharingan eye. The clan members pupil will turn red and develop three of the wheel swirls in both eyes. In this form the clan member can read Genjutsu, Taijutsu and Ninjutsu, learn how the skill is done and then copy it to be used later. This form can also initiate the Mangekyou "Kaleidoscope" form.

Sharingan - Mangekyou (Kaleidoscope) Form - word cost 3,000 word un mastered, 3,500 mastered.

This is the rare Mangekyou (Kaleidoscope) form which is said to only appear in a few Uchiha members. Uchiha Itachi was able to finally master this form during the period he killed his clan. In this form Itachi is able to use the Amaterasu and Tsukuyomi Doujutsu techniques.

Sharingan - Eternal Mangekyou (Kaleidoscope) Form-Must have killed and had transplanted the eyes of another Mangekyou user-word cost 4,000 words un mastered, 4,500 mastered.

Unable to accept being blind, Madara did everything he could to regain his vision. A desperate Madara eventually removed his brother's eyes to use as his own. As a result, Madara awakened a new more powerful set of eyes which allowed him to see the light once again. This new eye form would combine the look of both he and his brother's Mangekyou Sharingan.