Pupilla vs Virtual Refractor
Quick answer
Virtual Refractor, first created in 1998 by Dr Jack Alexander and developed by the Brien Holden Vision Institute and Foundation, simulates subjective refraction at distance and near with a refractor head: virtual patients answer your questions and read charts, with adjustable difficulty, a tutorial mode and immediate feedback. Pupilla covers the other half of refraction: objective streak retinoscopy with trial lenses, a refraction optics simulator showing Sturm's conoid, a vision simulator with logMAR and Snellen, and a lensometer — free, with an Arabic interface. Most students benefit from both.
Try Pupilla freeSide-by-side comparison
| Feature | Pupilla | Virtual Refractor |
|---|---|---|
| Made by | Pupilla (independent educational project) | Created by Dr Jack Alexander (1998); developed by the Brien Holden Vision Institute and Brien Holden Foundation |
| Subjective refraction with a refractor head | Not offered — use Virtual Refractor for this | Yes — distance and near, patients respond to questions and charts |
| Objective refraction (retinoscopy) | Yes — streak retinoscopy with trial-lens neutralization and working distance | Not listed on its page |
| Optics behind the prescription | Yes — axial length, corneal power, astigmatism and Sturm's conoid in the refraction simulator | Not listed on its page |
| What the patient sees | Yes — chart, text and night scene blurred by the refractive error, live logMAR/Snellen | Patients read charts according to your lens choices |
| Lensometry | Yes — manual lensometer with Prentice's rule | Not listed on its page |
| Feedback | Practice cases with feedback and guided tours | Immediate feedback; tutorial mode; adjustable difficulty |
| Platform | Any modern browser, including phones | Modern browser with WebGL; internet connection required |
| Language | English and Arabic (full interface, guides and FAQ) | Not listed |
| Cost | Free, no account | Not stated on its page |
Choose Virtual Refractor if…
- You want to practise the full subjective refraction routine at a refractor head with a patient who answers back.
- Your optometry programme already uses it.
Choose Pupilla if…
- You need objective refraction — streak retinoscopy and lens neutralization — before or alongside subjective refraction.
- You want to understand why a prescription works: the optics, the blur the patient sees and how to verify the finished glasses on a lensometer.
- You study in Arabic or on a phone.
Frequently asked questions
What is the difference between subjective and objective refraction?
Objective refraction measures the refractive error without the patient's answers, for example with retinoscopy or an autorefractor; subjective refraction refines it from the patient's responses ("better one or two?"). A full refraction usually starts objective and finishes subjective.
Is there a free online refraction simulator?
Yes. Pupilla's refraction simulator, retinoscopy simulator and vision simulator are free in the browser, with no account.
Sources for this comparison
Other comparisons
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For education and training only. Pupilla is not a medical device and must not be used for diagnosis or treatment decisions.