Sight is an ability present in Spore exclusive to eyes. It is purely aesthetical and only affects the player's creature during the Cell Stage and Creature Stage while the rest of the stages will play unrestricted.
In both the creature and cell stage, if the graphics effects setting is on low quality, blind creatures or cells will still have color vision although the field of vision will remain blurred around the edges.
Originally, the game designers planned to have a varying array of eyes with different capabilities (e.g. basic eyes having blurry vision, advanced eyes having a sharper vision), however this idea was dropped since players might get frustrated when not being able to see properly, and every eye in the final version of Spore is only different in appearance.
Cell stage Edit
In the cell stage, having eyes enables color vision and allows to see further. Without eyes, parts of the screen edges are black, but the visible area is still large enough for it not to be a major hindrance.
Creature Stage Edit
In the creature stage, not having eyes greatly restricts the visible area and makes vision much more desaturated. However, food and creatures will leave behind scent trails that appear as colored smudges.
Parts granting Sight Edit