Scotoma and Vision defect

Scotoma noun - An isolated area of diminished vision within the visual field.

Vision defect and scotoma are semantically related. In some cases you can use "Vision defect" instead a noun "Scotoma".

Vision defect noun - Impairment of the sense of sight.

Scotoma and vision defect are semantically related. Sometimes you can replace term "Scotoma" with "Vision defect", this terms are similar.