Direct Perception as Pramāṇa
Pratyakṣa ('direct' or 'before the eye') is the first and most immediately convincing of the three pramāṇas (valid means of knowledge) recognized in Vishishtadvaita: pratyakṣa (direct perception), anumāna (inference), and śabda/āgama (scriptural testimony). Pratyakṣa is knowledge arising from direct sensory contact with its object.
Types of Pratyakṣa
Vishishtadvaita recognizes two forms: (1) laukika pratyakṣa — ordinary sensory perception of external objects; and (2) alaukika pratyakṣa — extraordinary direct cognition, including the yogin's direct perception of subtle objects and the mukta's direct experience (sākṣātkāra) of Brahman in Vaikuṇṭha. The Āzhvārs' direct vision of the Lord in His archa form is also considered a form of alaukika pratyakṣa granted by divine grace.
Limitations of Pratyakṣa
Ordinary pratyakṣa cannot perceive Brahman, the ātman in its pure state, or liberation — these are beyond the reach of the senses. This is why the other pramāṇas, especially śabda (scriptural testimony), are indispensable. Śāstra tells us what pratyakṣa and anumāna cannot reach.
In Vishishtadvaita Epistemology
Rāmānuja accepts pratyakṣa as genuinely valid within its domain — he does not claim the world perceived by the senses is illusory (as Advaita does). The world as perceived is real, though it must be understood correctly through the Upaniṣadic teaching that all this is Brahman's body.