Day blindness and Visual defect

Day blindness noun - Inability to see clearly in bright light.

Visual defect and day blindness are semantically related. In some cases you can use "Visual defect" instead a noun phrase "Day blindness".

Visual defect noun - Impairment of the sense of sight.

Day blindness and visual defect are semantically related. Sometimes you can replace phrase "Day blindness" with "Visual defect", this phrases are similar.