Comparison

Eye Handbook vs iTorsion

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Eye Handbook

A comprehensive eye care reference app for ophthalmologists, optometrists, and students. It offers diagnostic tools, treatment references, calculators, educational resources, and community forums to support eye care professionals.

Highlights
  • Diagnostic and treatment reference
  • Eye calculators (visual acuity, diabetic retinopathy, etc.)
  • Medication and pharmacopeia
  • Ophthalmology and optometry journals
  • Patient education tools
  • Peer-to-peer forums
  • Eye atlas and diagrams
Features
Read full description

Eye Handbook (EHB) is an eye care reference book and an all-in-one app for Ophthalmologists, Optometrists as well as Students/Residents pursuing the field of eye care. The Eye Handbook is a smartphone diagnostic and treatment reference app for Ophthalmologists and Optometrists. Below is a list of some of the common features. -Eye Calculators -Transposition Calculator -Visual Acuity Calculator -Age to bifocal -Diabetic Retinopathy Severity Calculator -Dry Eye Disease Calculator -Glaucoma Risk Calculator -Thyroid Eye Disease Calculator -Retinoblastoma Calculator -EHB Indirect Camera -Ocular Trauma Score -Plaquenil Dosing -IOP-CCT -Pupillary Distance -DDX -Testing -ICD9 coding -ICD9 to ICD10 converter -ICD10 coding -Audio, Video downloads -Directory -Eye Atlas -Eye Wiki -Peer-to-peer Forums -Connecting with patients -Ophthalmology and Optometry Journals -Medication and Pharmacopeia -Journals -Eye Diagrams -Patient Education tools -RSS Feeds -Acronym List -Dictionary -Eponyms -Genetics -Mnemonics -Workups -Treatment Reference -Vision Symptoms Cards If you have content that you would like to contribute; please contact us at eyehandbook@gmail.com. Please feel free to contact us with any questions you may have. We are constantly striving to improve this application and welcome your feedback. www.eyehandbook.com The Eye Handbook Team

About

iTorsion

This medical app simplifies diagnosing ocular torsion using just a smartphone and red/green glasses. It offers greater precision than traditional methods, providing extorsion and intorsion measurements for each eye after a patient test.

Highlights
  • Ocular torsion diagnosis
  • Smartphone-based testing
  • Red/green glasses compatibility
  • Precise measurement
  • Extorsion and intorsion calculation
  • Customizable color values
Features
Read full description

iTorsion seeks to make the diagnosis of ocular torsion a simpler and easier process for both doctors and their patients. While traditional diagnostic methods require using special equipment (e.g., Double Maddox Rod) that often lacks precision, iTorsion only requires a smartphone and red/green glasses leading to much greater precision. This application is intended for use by doctors, and not for self-diagnosis by patients. Usage of the application will require standard red-green glasses to filter out colors from each eye. The specific color values can be tailored in the app to fit the specific requirements for the display and the glasses. The smartphone should be held on a level surface as the patient interacts with it. The patient should see predominantly one of the lines out of each eye, and will be asked to make the lines parallel with each other, as well as to the ground. After finishing the test, a screen will indicate the degree of extorsion and intorsion for each of the patient’s eyes.

Screenshots

Eye Handbook4 screens
iTorsion3 screens

Verdict

The call

The clearest difference is ads: iTorsion at none against Eye Handbook's shown. iTorsion also leads on review sentiment (100% vs 82%) and monetization model (free vs ad-supported). Eye Handbook's advantage is ratings volume (1.2K vs 6) and update cadence (every 3 weeks vs every 3 months). On price, rating, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

iTorsion holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Eye Handbook has 1.2K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 82% of Eye Handbook's written reviews are positive against 100% of iTorsion's.

UpkeepUpdate frequency

Eye Handbook ships an update every 3 weeks, iTorsion every 3 months. The most recent releases landed on November 1, 2026 and October 12, 2026 respectively.

Scorecard6 real differences · 4 level
Eye Handbook versus iTorsion: the parameters behind the verdict, then further details
ParameterEye HandbookiTorsion
PriceFreeFree
Rating4.8 (1.2K ratings)5.0 (6 ratings) — better
Positive reviews82.2% of reviews100.0% of reviews — better
Number of ratings1.2K — better6
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.010.3 — better
Further details — not scored
Size480 MB17 MB
Age rating17+17+
DeveloperCloud Nine Development LLCRegents of the University of Minnesota

Customer experience

Eye Handbook

All ratings1,157 ratings
Positive95.8%
Neutral1.3%
Negative2.9%
Written reviews163 reviews
Positive82.2%
Neutral5.5%
Negative12.3%

iTorsion

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Eye Handbook

Reported bugs

3 issues
  • Registration process issues
  • Compatibility problems with newer iOS versions
  • Incorrect medication information

Requested features

4 requests
  • Add Tumbling E and Landolt C charts
  • Improve search functionality
  • Provide a paid ad-free version
  • Optimize for larger screens (iPad)

iTorsion

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Eye Handbook

No in-app purchases

None

iTorsion

No in-app purchases

Questions

Is Eye Handbook free?
Eye Handbook is free to download, with no in-app purchases.
Is iTorsion free?
iTorsion is free to download, with no in-app purchases.
Which has better reviews, Eye Handbook or iTorsion?
iTorsion is rated higher. Eye Handbook averages 4.8 out of 5 from 1.2K ratings, while iTorsion averages 5.0 from 6 ratings.
Do Eye Handbook or iTorsion have ads?
Eye Handbook shows ads; iTorsion does not.
Which is updated more often, Eye Handbook or iTorsion?
Eye Handbook ships an update every 3 weeks, and iTorsion every 3 months. Most recently, Eye Handbook was updated on November 1, 2026 and iTorsion on October 12, 2026.

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