Various embodiments are generally directed to a trocar cannula for providing a surgical instrument with access to the interior of an eye, such as a soft tip cannula used in ocular surgery, for instance. Some embodiments are particularly directed to a trocar cannula that facilitates alignment of a surgical instrument with an axis of the cannula with a guidance valve. In one or more embodiments, the trocar cannula may keep one or more portions of the surgical instrument straight as the surgical instrument utilizes the trocar cannula to access the interior of an eye. Many embodiments are directed to a trocar cannula that reduces the amount of intraocular pressure loss when a surgical instrument utilizes the trocar cannula to access the interior of an eye.
