CREATE TABLE table_train_165 ("id" INT, "gender" TEXT, "hemoglobin_a1c_hba1c" FLOAT, "visual_impairment" BOOLEAN, "blood_glucose" INT, "body_mass_index_bmi" FLOAT, "a1c" FLOAT, "age" FLOAT, "NOUSE" FLOAT)

a severe visual impairment
SELECT * FROM table_train_165 WHERE visual_impairment = 1
SELECT * FROM "table_train_165" WHERE "visual_impairment" = 1