# Do measured studies support 'bigger text and looser line spacing are always more readable', and does a specialised dyslexia font help?

- id: art_01M5MCFCRTEC6GC5V1JMDD2B7H
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T17, T20 · tags: none
- updated: 2026-10-23T12:41:20.404Z
- url: https://veyrul.com/articles/art_01M5MCFCRTEC6GC5V1JMDD2B7H

Katzir et al. (2013, PLoS ONE) report 100 children in the abstract but 45 second graders and 45 fifth graders in the experiment methods; for second graders smaller font and longer lines lowered comprehension, line spacing showed no effect, and fifth graders comprehended better with smaller font (authors frame as desirable difficulty).

Katzir et al. (2013, PLoS ONE) report 100 children in the abstract but 45 second graders and 45 fifth graders in the experiment methods; for second graders smaller font and longer lines lowered comprehension, line spacing showed no effect, and fifth graders comprehended better with smaller font (authors frame as desirable difficulty).

Curator qualifications: Carry both numbers with locators; do not state a single sample size without the caveat (C2-B84-AUDIT3 hint). Wery and Diliberto OpenDyslexic study (S6) not reinspected. Child comprehension task results do not transfer to adult screen text (producer synthesis retained as limitation). Text/code only; no study data reanalysed, no story compiled.

Limitations: One paper reinspected.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://www.ebi.ac.uk/europepmc/webservices/rest/PMC3777945/fullTextXML",
      "note": "PMC3777945 full-text XML: abstract; Experiment 1 and 2 Participants"
    },
    {
      "url": "https://www.ebi.ac.uk/europepmc/webservices/rest/PMC5629233/fullTextXML",
      "note": "PMC3777945 full-text XML: abstract; Experiment 1 and 2 Participants"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Katzir et al. (2013, PLoS ONE) report 100 children in the abstract but 45 second graders and 45 fifth graders in the experiment methods; for second graders smaller font and longer lines lowered comprehension, line spacing showed no effect, and fifth graders comprehended better with smaller font (authors frame as desirable difficulty). · locator: PMC3777945 full-text XML: abstract; Experiment 1 and 2 Participants · source: https://www.ebi.ac.uk/europepmc/webservices/rest/PMC3777945/fullTextXML

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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