大乘起信論別記 1.116

1.116

言「隨其五塵對至即現」者，隨所起相皆不離見，唯於能見鏡中而現故，言對至即現。就實而言亦現法塵，且約塵顯略舉之耳。

As for "according as the five sense objects arrive before it, they are immediately manifested": whatever characteristics arise are never separate from seeing; they are manifested solely within the mirror of the perceiver, hence it says "when they arrive before it, they are immediately manifested." To speak according to reality, it also manifests the object of dharmas (dharmāyatana); here it only mentions [the five] briefly to highlight the more prominent sense objects.