A person is unable to view three dimensions of the object he is viewing due to:



Cross-eyed:
If a person is cross-eyed, it means their eyes are not properly aligned and do not work together to focus on the same point. This can result in a condition called strabismus, where the eyes appear to be looking in different directions. When the eyes are not aligned, it can affect depth perception and the ability to view objects in three dimensions. The person may see the object as flat or two-dimensional.



Color blind:
Color blindness is a condition where a person has difficulty distinguishing certain colors or perceiving them correctly. It is usually caused by a genetic defect that affects the way the eye's photoreceptor cells respond to light. While color blindness does not directly affect the ability to view objects in three dimensions, it can make it harder to perceive depth cues that rely on color differentiation, such as shading or color gradients.



Glaucoma in one eye:
Glaucoma is a group of eye diseases that can damage the optic nerve and cause vision loss. If a person has glaucoma in one eye, it can lead to a condition called monocular vision. This means that each eye sees independently and does not work together to provide binocular vision. Binocular vision is essential for perceiving depth and viewing objects in three dimensions. Without binocular vision, the person may have difficulty judging distances and perceiving depth accurately.



Conjunctivitis:
Conjunctivitis, also known as pink eye, is an inflammation of the conjunctiva, the thin clear tissue that covers the white part of the eye and lines the inner surface of the eyelids. This condition can cause redness, itching, and discharge from the eyes. Although conjunctivitis itself does not directly affect the ability to view objects in three dimensions, it can cause temporary blurriness or discomfort in the affected eye. This can potentially impact depth perception and make it more challenging to perceive objects in three dimensions.

In conclusion, a person may be unable to view three dimensions of an object if they are cross-eyed, color blind, have glaucoma in one eye, or are suffering from conjunctivitis. Each of these conditions affects different aspects of vision and can impact the ability to perceive depth and view objects in three dimensions.