не видеть + Genitive / Accusative

In Russian, negated verbs often trigger a case shift for their direct objects. With the verb видеть (to see), this choice is a powerful tool for nuance. Note that видеть belongs to a class of perception verbs that historically favor the Genitive more than action verbs.

• The Genitive Case: Historically the standard for all negated objects. Today, it is used to show total negation or existential negation (where the object does not exist at all in the context). It is preferred for abstract nouns, in formal or literary registers, and when using the emphatic particle ни (not a single) or the conjunction ни... ни... (neither... nor...), which almost always requires the Genitive (e.g., Я не вижу ни гор, ни холмов). It is also strictly mandatory in certain set phrases and idioms (e.g., света белого не видеть).
• The Accusative Case: This is the modern standard for colloquial, everyday speech, especially with concrete, specific objects. If you are looking for your keys and don't see them, they still exist; you just haven't spotted them. Demonstrative pronouns (like этот, тот) make the Accusative highly natural, though the Genitive remains perfectly grammatical and common. Proper names of people strongly favor the Accusative case (e.g., Я давно не видел Анну); using the Genitive here is considered archaic and is mostly found in older literature.

Important Nuances:
1. Animacy Neutralization: For animate masculine nouns and animate plurals, the distinction is neutralized because the Accusative and Genitive forms are identical (e.g., я не вижу брата). The 'concrete vs. abstract' logic results in a visible change for inanimate masculine, neuter, inanimate plural nouns, and feminine singular nouns.
2. Verb Negation Only: The genitive shift only applies if the verb is negated. If you say 'I see not the mountains, but the hills' (Я вижу не горы, а холмы), use the Accusative.
3. Negated Infinitives: When видеть is an infinitive following a negated governing verb (e.g., я не хочу видеть...), modern Russian frequently uses the Accusative case for the object because the force of the negation is weakened, though the Genitive remains grammatically permissible.
4. Pronouns: Negative pronouns like ничего (nothing) or никакого (e.g., не вижу никакого смысла) must be in the Genitive.
5. Double Negation: When double negation occurs (e.g., не могу не видеть), the negation is logically canceled, and the Accusative case is strictly required (e.g., Я не могу не видеть эту ошибку).
6. Rhetorical Questions and Exclamations: If the negated verb is part of a rhetorical question or exclamation that doesn't actually express a negative meaning, the Accusative is strongly preferred (e.g., Разве ты не видишь эту надпись?).
7. Word Order: If the direct object is placed before the negated verb, the Accusative is strongly preferred to avoid ambiguity (e.g., Эту ошибку я не видел).
8. Impersonal 'не видно': The impersonal predicative не видно (it is not visible / cannot be seen) strongly triggers the Genitive case (e.g., Ничего не видно, Из окна не видно моря).