Recepta na okulary podaje dwie dioptrie.

Here recepta means prescription, especially a medical one.

It is a classic false friend for English speakers:

• recepta = prescription
• recipe = usually przepis in Polish

So recepta na okulary means a prescription for glasses, not a recipe for glasses.

In this sentence, na means for in the sense of intended for or meant for.

Polish commonly uses the pattern:

recepta na coś = a prescription for something

So:

• recepta na okulary = a prescription for glasses
• recepta na lek = a prescription for a medicine

After na in this meaning, Polish uses the accusative case.

In Polish, okulary is normally a plural-only noun when it means glasses.

This works like English glasses, scissors, or pants:

• one pair of glasses = okulary
• not normally a singular form for ordinary eyewear

The singular okular exists, but it usually means something like an eyepiece or a single optical piece, not everyday glasses.

So even if you mean one pair, Polish still says okulary.

Because na here requires the accusative, not the genitive.

The noun okulary has:

• nominative plural: okulary
• accusative plural: okulary
• genitive plural: okularów

So in recepta na okulary, the form is accusative plural, which happens to look the same as the nominative plural.

You would use okularów in a genitive context, for example:

• Nie mam okularów = I don’t have glasses

Yes, the basic meaning of podaje is related to gives, hands, or passes, but in this kind of sentence it means:

• states
• gives
• lists
• specifies

So Recepta na okulary podaje dwie dioptrie means something like:

• The glasses prescription states two diopters
• The prescription gives a value of two diopters

This is normal Polish usage when the subject is a document, text, chart, label, and so on.

Because Polish, like English, often uses the present tense to talk about what a document or text says.

Compare English:

• The label says...
• The report states...
• The prescription gives...

Polish does the same:

• etykieta podaje...
• raport podaje...
• recepta podaje...

So the present tense does not mean the prescription is actively doing something right now; it just describes the information written on it.

Because dioptria is a feminine noun.

In Polish, the numeral 2 changes form depending on gender:

• dwa for many masculine and neuter nouns
• dwie for feminine nouns

Since the singular is:

• ta dioptria = this diopter (feminine)

the correct form is:

• dwie dioptrie = two diopters

It is the direct object of podaje, so it is in the accusative.

However, with feminine nouns after 2, 3, 4, the accusative plural often looks the same as the nominative plural.

So:

• nominative singular: dioptria
• accusative singular: dioptrię
• nominative plural: dioptrie
• accusative plural: dioptrie

That is why you see dwie dioptrie here.

Polish has no articles, so there is no separate word for a or the.

That means recepta can mean:

• a prescription
• the prescription

The exact meaning depends on context.

So this sentence could be understood as either:

• A glasses prescription states two diopters
• The glasses prescription states two diopters

No, Polish word order is fairly flexible.

Recepta na okulary podaje dwie dioptrie is a normal, neutral order:

• subject: Recepta na okulary
• verb: podaje
• object: dwie dioptrie

But Polish can move things around for emphasis. For example, a different order might sound more marked or contrastive.

So the given sentence is natural, but not the only possible word order.

It is grammatically correct and understandable, but in real life people might often say something a bit more specific.

For example, prescriptions for glasses usually give separate values for each eye or give more detailed parameters. So you might also hear things like:

• Na recepcie są podane dwie dioptrie.
• Recepta podaje moc dwóch dioptrii.
• Na recepcie masz minus dwie dioptrie.

So the original sentence is fine for learning grammar and vocabulary, but in a real optician’s context Polish often gets more specific.