Breakdown of Поле зрения и межзрачковое расстояние нужно проверить.
и
and
проверить
to check
нужно
necessary
межзрачковое расстояние
the pupillary distance
Questions & Answers about Поле зрения и межзрачковое расстояние нужно проверить.
Why is поле зрения written as two words, and what case is зрения in?
Поле зрения is a fixed noun phrase meaning field of vision or visual field.
- поле = field
- зрения = of vision / of sight
Here, зрения is in the genitive singular. Russian often uses this structure where one noun modifies another:
- поле зрения = field of vision
- центр города = center of the city
- чашка чая = cup of tea
So зрения is not a separate main part of the sentence; it depends on поле.
What case are поле and межзрачковое расстояние in here?
They are functioning as the things that need to be checked, so logically they are the direct objects of проверить.
That means they are in the accusative case. However, for these particular words, the accusative looks exactly like the nominative:
- поле — nominative singular / accusative singular
- расстояние — nominative singular / accusative singular
So even though they look like nominative forms, in this sentence they are understood as accusative because they are the objects of проверить.
Why is нужно singular even though there are two things: and ?