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Operating principle and advantages
The method of individual surgical intervention modeling in horizontal concomitant strabismus STRABO according to IE Aznauryan is used to calculate enhancing and weakening interventions on the oculomotor muscles.
For combined enhancing/weakening interventions in concomitant convergent strabismus, the determination of dosage is performed through biomechanical calculations of the enhancement value for the muscle at the side opposite to the operated eye deviation, taking into account the following anthropometric eye parameters:
- the objective angle of strabismus is determined by a known method using haploscopic devices, as well as using visual oculography;
- eye anterior-posterior axis length - determined by ultrasonic A-scanning;
- static eye refraction - determined by the study of the eye optical power under complete drug cycloplegia;
- interpupillary distance.
However, as a general rule, the enhancing intervention dosage at each step is no more than 8 mm. If the enhancing intervention dosage is 6 mm and more, an additional weakening intervention of horizontal rectus muscle at the side of operated eye deviation is performed. The dosage for the weakening intervention is also calculated automatically.
For weakening interventions in concomitant strabismus, the determination of dosage is performed through biomechanical mathematical calculation of the attenuation value for the muscle at the side corresponding to the operated eye deviation, taking into account the following anthropometric parameters:
- the objective angle of strabismus is determined by a known method using haploscopic devices, as well as using visual oculography;
- eye anterior-posterior axis length - determined by ultrasonic A-scanning;
- the length of the transverse axis of the eye is determined by ultrasonic B-scanning or MRI.
- The diameter of the cornea is determined by the OCT of the anterior segment.
The following parameters are calculated automatically:
- intervention dosage
- residual deviation
- the number of steps required to achieve orthotropy.
Moreover, the doctor has the opportunity to simulate the result of the intervention during the calculation step, and demonstrate the result clearly to the patient before the procedure starts.
Advantages of the STRABO mathematical modelling | ||
|---|---|---|
| Classic approach | STRABO mathematical modelling | |
| Pre-operative diagnostics | Classical examination methods are based on the subjective response of the patient. Only the individual parameters of the angle of view are assessed objectively. | The application of the Gazelab apparatus allows us to take into account all the anthropometric parameters of the eyeball (eye length, myopia, hyperopia and their severity, etc.). The only technology allowing to determine the strabismus angle with nystagmus, regardless of the amplitude of the oscillations. |
| Performing the procedure | The doctor doses the surgical intervention, based on his own experience and the examination results obtained. | Mathematical modeling allows to predict the steps of intervention and reduce their number, dose the intervention (dosing accuracy +/- 0.5°), predict the result of the intervention, balance the calculation for 2 eyes. The use of high-frequency radio wave surgery provides bloodlessness and minimally invasive intervention. |
| Rehabilitation | The edema, soreness and discomfort in the area of surgery go away within 5-8 days. | The recovery period takes at least a month. Bloodless, mini-invasive intervention, without seams and subsequent cicatricial changes. The patient is discharged on an outpatient treatment on the very next day. The rehabilitation lasts about a week. |
| Result | High probability of under-correction (strabismus angle is not completely eliminated) and hypercorrection (development of reverse strabismus) | Predictable result - individual calculation of strabismus correction STRABO provides high accuracy - up to 0.5°. The probability of hypo- and hypercorrection is reduced practically to zero. |
Advantages
The application of the STRABO program of IE Aznauryan in combination with diagnostic methods and low-traumatic surgical technology "STRABO care" allows us to achieve the accuracy of the intervention dosage for concomitant strabismus ± 5 degrees.
All the calculations are designed as guidelines.
Tariffs for using the service
| Tariff | Limit | Сost |
| “For individuals” | 6 calculations per month | 140 USD |
| “For legal entities” | 10 calculations per month | 420 USD |
| “For individuals - quarter” | 15 calculations per quarter | 328 USD |
| “For legal entities - quarter” | 20 calculations per quarter | 844 USD |