Disadvantages of having two eyes
Answers
1. Decreased Visual Field
A creature with binocular vision might have the ability of depth perception but cannot enjoy a wider visual field unlike preys with monocular vision that can see from behind. Since the eyes are both located in front, a creature with binocular vision can also see in front and from the peripheral view but not beyond these two.
2. Limited Focus
The placement of the eyes which are proximal to each other allows for a creature to see an image and focus on a single image. This means that the creature will not be able to see another object from the sides or behind since the brain sends signals to the eyes to focus on only one image.
3. Prone to Disorders
Binocular vision can suffer from different visual disorders and anomalies. These include visual confusion, suppression and diplopia. Also, these anomalies can result to blurred vision, headache and eye pain, among others.
Binocular vision has more advantages than disadvantages. Although creatures with this type of vision do not have a wider field of vision, there are more benefits they can enjoy from having their eyes located just inches apart.