Certified Ophthalmic Technician Practice Test 2025 – Complete Exam Prep

The visual defect described as a complete type of nerve fiber bundle defect that arches over central fixation is indeed known as a Bjerrum scotoma. This condition typically occurs in the context of glaucoma, where there is damage to the optic nerve leading to distinctive patterns of vision loss.

In this situation, the Bjerrum scotoma appears as an arc-shaped scotoma that affects peripheral vision but allows for central vision to remain intact. This arc usually spans from the central visual field out toward the periphery, forming a "U" shape over the point of fixation. This pattern is significant because it helps in diagnosing certain types of visual field defects associated with optic nerve damage, particularly those related to glaucoma.

The other visual defects mentioned describe different patterns of vision loss. Homonymous hemianopia involves loss of the same field of vision in both eyes, typically after a stroke affecting the pathways behind the optic chiasm. A central scotoma is characterized by a loss of vision directly in the center of the visual field, which does not arc but rather affects the focal point of vision. Paracentral scotoma refers to a small area adjacent to the central fixation point that is affected, differing in both location and presentation from the characteristic arch