طول النظر في وصفة النظارة.

Usually, no. It reads more naturally as a noun phrase or a label, not a full sentence with a verb.

Arabic often uses short verbless phrases in:

• headings
• forms
• charts
• medical documents

So on an eye exam form, this could simply be the line for farsightedness in/on the glasses prescription.

Because طول النظر is a fixed expression in Arabic.

Literally, it is something like:

• طول = length / longness
• النظر = sight / vision

But together, طول النظر means long-sightedness, i.e. farsightedness / hyperopia.

A useful comparison is:

• طول النظر = farsightedness
• قصر النظر = nearsightedness

So this is best learned as a whole medical term, not just translated word by word.

Because this is an iḍāfa construction, often called a construct phrase: noun + noun.

In an iḍāfa:

• the first noun does not take ال
• the second noun can be definite, and that makes the whole phrase definite

So:

• طول النظر
• not الطول النظر

The same pattern appears in:

• وصفة النظارة

Here too, وصفة is the first noun in an iḍāfa, so it does not take ال.

Because the first noun in an iḍāfa cannot take tanween.

So you say:

• وصفة النظارة

not:

• وصفةٌ النظارة

This is a very common rule:

• first noun in iḍāfa: no ال, no tanween
• second noun in iḍāfa: usually genitive

Arabic uses في very naturally here, even though English may prefer on.

So:

• في وصفة النظارة literally = in the glasses prescription
• but natural English may be on the glasses prescription

This is a normal preposition difference between the two languages. Arabic often uses في where English might use in, on, or even within, depending on context.

Because Arabic and English package this object differently.

In English, glasses is grammatically plural.
In Arabic, نظارة / نظّارة can refer to a pair of glasses as a single item.

So:

• النظارة can mean the glasses
• even though English uses a plural word

You may also see نظارات, but the singular is very common when talking about eyewear as one object.

A practical pronunciation is:

ṭūl an-naẓar fī waṣfat an-naẓẓāra

A few helpful notes:

• النظر is pronounced an-naẓar, because the l of ال assimilates to ن
• نظارة meaning glasses is really نظّارة with a doubled ظ, but the shadda is often omitted in normal writing
• the final ة in وصفة is pronounced -t here, because it is the first word in an iḍāfa: waṣfat

So learners often miss two things here:

1. the doubled consonant in نظّارة
2. the pronounced -t in وصفة

If fully vocalized, you could write it as:

طولُ النظرِ في وصفةِ النظارةِ

Here is why:

• طولُ = nominative
• النظرِ = genitive, because it is the second noun in an iḍāfa
• وصفةِ = genitive, because it comes after في
• النظارةِ = genitive, because it is the second noun in another iḍāfa

In normal everyday Arabic, these case endings are usually not written and often not pronounced in full.

No. وصفة is a flexible word, and its meaning depends on context.

It can mean:

• recipe
• prescription
• formula
• set of instructions

Here, because of النظارة, it clearly means prescription, specifically an eyeglass prescription.