Measurement Method
Anigma View assumes the horizontal diameter of the iris to be 11.5mm for measurements.
The horizontal diameter of the iris can be adjusted in the Measurement Options Editor.
The [Measurement Options Editor] can be activated by pressing the "Edit" button on the right side of the measurement item display
The horizontal diameter of the iris varies between individuals, and caution should be taken when using the tool as the size of the irises may differ between both eyes.
Suggestions for Utilizing Iris-Based Measurements in Anigma View
More suitable for consultations than for highly accurate research purposes.
If circle lenses are worn, the diameter changes significantly to 13~15mm, so caution is required as the horizontal iris diameter will be considerably altered.
Measurement errors may occur if there is a significant difference in iris size between both eyes or if the individual’s iris size deviates substantially from the average due to personal variation.
The average measurement error is around 5%, but personal differences should be considered.
For measurements prone to larger errors, such as the distance between inner eye corners or eyebrow height, it is recommended to use ratios rather than absolute values.
For academic purposes, it is recommended to place a 5mm sticker between the eyebrows, take a photo, and use that as the basis for measurements.
Rationale and Usefulness
Anigma View assumes the horizontal diameter of the iris to be 11.5mm for measurements.
Reference
Venkataraman, S.K. Mardi, S. Pillai, Comparison of eyemetrics and Orbscanautomated method to determine horizontal corneal diameter, Indian J. Ophthalmol. 58 (3) (2010) 219–222.
F.M.D. Rufer, A.M.D. Schroder, C.M.D. Erb, White-to-white corneal diameter:normal values in healthy humans obtained with the Orbscan II topographysystem, Cornea 24 (3) (2005) 259–261.
H.M.D. Hashemi, et al., White-to-white corneal diameter in the Tehran eye study,Cornea 29 (1) (2010) 9–12.
S. Sporri, et al., Objective assessment of tip projection and the nasolabial anglein rhinoplasty, Arch. Facial Plast. Surg. 6 (5) (2004) 295–298 (discussion299–300).
List of Studies Based on Iris Measurement
In the study, the iris horizontal length is assumed to be 11mm, 11.5mm, and 12mm in various cases.
Comparison of the effectiveness and safety of the "endoscope-assisted polypropylene mesh lift" and "gliding brow lift" techniques for the treatment of lateral brow ptosis. Şibar S, Erdal AI, Deniz E, Kılıç Ö, Tuncer S.J Plast Reconstr Aesthet Surg. 2023 Aug;83:455-462. doi: 10.1016/j.bjps.2023.04.079. Epub 2023 May 2.
Objective Brow Height Measurements Following Pretrichial Brow Lift and Upper Lid Blepharoplasty. Martin M, Shah CT, Attawala P, Neaman K, Meldrum M, Hassan AS.J Cutan Aesthet Surg. 2016 Apr-Jun;9(2):93-6. doi: 10.4103/0974-2077.184041.
A deep learning framework to scale linear facial measurements to actual size using horizontal visible iris diameter: a study on an Iranian population. Pirayesh Z, Hassanzadeh-Samani S, Farzan A, Rohban MH, Ghorbanimehr MS, Mohammad-Rahimi H, Motamedian SR.Sci Rep. 2023 Aug 23;13(1):13755. doi: 10.1038/s41598-023-40839-6.
Important Notes
The horizontal diameter of the iris varies between individuals, and there may be differences in the size of irises between both eyes.
The average horizontal diameter of the iris ranges from 10.26 to 12.25mm, with individual variations. A broader range of 9.0 to 14.5mm has been reported.
FAQ
The measurement seems incorrect. (When the values are too large or too small)
Anigma View uses AI to distinguish detailed regions of the eye. Occasionally, segmentation may fail, leading to measurement errors. You can verify if the AI has correctly recognized each region by using the detailed region display feature.
If there is an error, you can press the "Edit" button on the right side of the measurement item display and make corrections in the [Measurement Options Editor].
The measurements vary each time I take a photo.
The most common cause of inaccurate or inconsistent measurements during eye region analysis is changes in head posture and the tension in the forehead.
To maintain consistent head posture, it is important to ensure the chin is not lifted too high, and the subject looks straight ahead during the photo. Pulling the chin too far back can also increase measurement errors.
When taking eye photos, it is crucial to have the subject close their eyes briefly, relax their forehead, and then comfortably look straight ahead before taking the photo.
Even with this method, there may still be an approximate error of 0.5 to 1mm. This is because the eyelids are dynamic organs, making it difficult to capture an exact value in a single shot. Despite these limitations, many SCI papers on eye measurements use this method, and taking two consecutive measurements and averaging the values can yield more accurate results.
Proper Photography Guide
Ensure that the Porion and Orbitale are aligned horizontally.
Relax your forehead and close your eyes briefly before taking the photo.
Look straight ahead with a neutral expression for accurate results.
Common Mistakes to Avoid
Do not tuck your chin, causing your eyes to widen unnaturally.
Do not lift your chin excessively.
Do not tense your forehead or forcefully open your eyes.
I compared my results with a celebrity or ideal type, but the values seem strange.
When using photos of celebrities or ideal types for comparison, it is important to ensure that the photos were taken correctly. If not, please take this into account when using them for consultation purposes.