---
title: Ascertain the purpose for which the occlusion of the stronger eye is… — The optician and glasses · tree and pragmatics
description: Ascertain the purpose for which the occlusion of the stronger eye is prescribed. Exam question 3 of lesson 27 «The optician and glasses» of the medicine course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Exam question 3 · The optician and glasses

<!-- .ven lang=en -->
Ascertain the purpose for which the occlusion of the stronger eye is prescribed.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you · **What happens:** ascertain, prescribe, occlude · **To what, where:** purpose, occlusion, stronger eye

<!-- .vabout -->
This is exam question 3 of lesson 27 «The optician and glasses» of the medicine course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/medicine/27-the-optician-and-glasses/#e3).

## The question {#question}

```conllu
# sent_id = question:medicine:27-the-optician-and-glasses:e3:1
# text = Ascertain the purpose for which the occlusion of the stronger eye is prescribed.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	purpose	purpose	NOUN	NN	Number=Sing	1	obj	_	_
4	for	for	ADP	IN	_	5	case	_	_
5	which	which	PRON	WDT	PronType=Rel	13	obl	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	occlusion	occlusion	NOUN	NN	Number=Sing	13	nsubj:pass	_	_
8	of	of	ADP	IN	_	11	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
10	stronger	strong	ADJ	JJR	Degree=Cmp	11	amod	_	_
11	eye	eye	NOUN	NN	Number=Sing	7	nmod	_	_
12	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	13	aux:pass	_	_
13	prescribed	prescribe	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl:relcl	_	SpaceAfter=No
14	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the purpose |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent purpose=Topic |
| 2 | **prescribe** | present · passive |  | the occlusion of the stronger eye |  |  |  | for the purpose | tree rules |
| 3 | **occlude** |  |  | the stronger eye |  |  |  |  | nom occlusion «state transitive»: of=patient |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
To compel the brain to employ the weaker eye

```conllu
# sent_id = question:medicine:27-the-optician-and-glasses:e3:o1:1
# text = To compel the brain to employ the weaker eye
1	To	to	PART	TO	_	2	mark	_	_
2	compel	compel	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	brain	brain	NOUN	NN	Number=Sing	2	obj	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	employ	employ	VERB	VB	VerbForm=Inf	2	advcl	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
8	weaker	weak	ADJ	JJR	Degree=Cmp	9	amod	_	_
9	eye	eye	NOUN	NN	Number=Sing	6	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **compel** | to-infinitive |  | the brain |  |  |  |  | vn compel-59.1-1 «NP V NP»: agent=Agent brain=Patient |
| 2 | **employ** | to-infinitive |  | the weaker eye |  |  |  |  | vn hire-13.5.3 «NP V NP»: agent=Agent eye=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
To dilate the pupil

```conllu
# sent_id = question:medicine:27-the-optician-and-glasses:e3:o2:1
# text = To dilate the pupil
1	To	to	PART	TO	_	2	mark	_	_
2	dilate	dilate	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	pupil	pupil	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **dilate** | to-infinitive |  | the pupil |  |  |  |  | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent pupil=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
To protect the stronger eye from any infection

```conllu
# sent_id = question:medicine:27-the-optician-and-glasses:e3:o3:1
# text = To protect the stronger eye from any infection
1	To	to	PART	TO	_	2	mark	_	_
2	protect	protect	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	stronger	strong	ADJ	JJR	Degree=Cmp	5	amod	_	_
5	eye	eye	NOUN	NN	Number=Sing	2	obj	_	_
6	from	from	ADP	IN	_	8	case	_	_
7	any	any	DET	DT	PronType=Ind	8	det	_	_
8	infection	infection	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **protect** | to-infinitive |  | the stronger eye |  |  |  | from any infection | vn defend-72.3 «NP V NP PP.theme»: agent=Agent eye=Beneficiary from infection=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
To correct colour blindness

```conllu
# sent_id = question:medicine:27-the-optician-and-glasses:e3:o4:1
# text = To correct colour blindness
1	To	to	PART	TO	_	2	mark	_	_
2	correct	correct	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
3	colour	colour	NOUN	NN	Number=Sing	4	compound	_	_
4	blindness	blindness	NOUN	NN	Number=Sing	2	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **correct** *speech: disagree* | to-infinitive |  | colour blindness |  |  |  |  | vn remedy-45.7 «NP V NP.patient»: agent=Agent blindness=Patient |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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