Day blindness and Vision defect

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

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

Vision defect noun - Impairment of the sense of sight.

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