A dioptria alacsony.

The lens power is low.

Breakdown of A dioptria alacsony.

• az: the
• alacsony: low
• dioptria: a dioptre; lens power

Questions & Answers about A dioptria alacsony.

Why is there no word for is in A dioptria alacsony?

In Hungarian, the verb to be is usually left out in the present tense when the subject is third person.

So:

• A dioptria alacsony = The diopter/prescription is low
• not A dioptria van alacsony

This is very normal in Hungarian.
You do use forms of van in other situations, but not in simple present-tense sentences like this one.

Compare:

• Én magas vagyok. = I am tall.
• Te fáradt vagy. = You are tired.
• Ő magas. = He/she is tall.

Notice that in third person singular, there is no separate word for is.

What does A mean here?

A is the definite article, meaning the.

Hungarian has two forms of the definite article:

• a
• az

Which one you use depends on the sound at the start of the next word:

• a before a consonant sound
• az before a vowel sound

Since dioptria starts with d, a consonant sound, Hungarian uses a:

• a dioptria

If the next word began with a vowel, you would use az instead.

Why is it a dioptria and not az dioptria?