METHOD FOR PREDICTING VISUAL ACUITY AFTER PHACOEMULSIFICATION OF INITIAL AND IMMATURE CATARACT IN HIGH DEGREE MYOPIA Russian patent published in 2019 - IPC A61B3/00 A61B8/10 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to ophthalmosurgery, and can be used to predict visual acuity (VA) following phacoemulsification of initial or immature cataract in myopia of high degree 1 and 6 months after operation. Preoperative examination of the periphery of the retina is performed by ultrasonic biomicroscopy, examination of a vitreous body by ultrasonic veta scanning, examination of central area of retina by means of spectral optical coherence tomography. Based on values of the anterior-posterior axis of the eye, high reflectivity of the choroid, posterior staphyloma, subfoveal thickness of the choroid, height of the posterior vitreous detachment, height of epiretinal membrane peeling, destruction of pigment epithelium, rarefaction of pigment epithelium, length of retinoschisis in the upper-external segment is used to calculate the probability of achieving VA Y by formula Y = 1-exp^P/ (1 + exp^P), where P = (b₀+ b₁⋅X₁+…+ b_nX_n); b₀ - free coefficient, b₁, …, b_n are regression coefficients of independent variables X₁, …, X_n. When determining the indicator of probability of achieving VA Y ≥ 0.3 1 and 6 months postoperatively X₁ is an anterior-posterior axis of the eye, X₂ is epiretinal membrane delamination height, X₃ high choreoid reflectivity, X₄ - posterior staphyloma, X₅ subfovible thickness of choroid, b₀= -37.4158, b₁= 1.1262, b₂= 0.01640, b₃= 2.165576, b₄= 0.393742, b₅= 0.000561. When determining the indicator of probability of achieving VA Y ≥ 0.4 1 and 6 months postoperatively X₁ is an anterior-posterior axis of the eye, X₂ is epiretinal membrane delamination height, X₃ - high reflectivity of choroid, X₄ - posterior staphyloma, X₅ subfovible thickness of choroid, b₀= -37.4158, b₁= 1.1262, b₂=0.01640, b₃= 2.165576, b₄= 0.393742, b₅= 0.000561. When determining the indicator of probability of achieving VA Y ≥0.7 1 month after operation X₁ is an anterior-posterior axis of the eye, X₂ - height of posterior vitreous detachment, X₃ is epiretinal membrane delamination height, X₄ - destruction of pigment epithelium, X₅ - rarefaction of pigment epithelium, X₆ high choreoid reflectivity, X₇ - posterior staphyloma, X₈ subfovible thickness of choroid, b₀= -3.21965, b₁= 0.087559, b₂= 0.20107, b₃= 0.005555, b₄= 0.866684, b₅= -0.396622, b₆= -0.303080, b₇= 0.439039, b₈= -0.009627. When determining the indicator of probability of achieving VA Y ≥0.7 6 months after surgery X₁ is an anterior-posterior axis of the eye, X₂ - height of posterior vitreous detachment, X₃ is epiretinal membrane delamination height, X₄ - destruction of pigment epithelium, X₅ - rarefaction of pigment epithelium, X₆ - high reflectivity of choroid, b₀= -8.002, b₁= 0.21983, b₂= 0.24868, b₃= 0.00313, b₄= 1.272495, b₅= -0.042341, b₆= -0.35775. When determining the indicator of probability of achieving VA Y ≥ 0.8 6 months postoperatively X₁ is an anterior-posterior axis of the eye, X₂ - height of posterior vitreous detachment, X₃ - length of retinoschisis in upper-external segment, X₄ is epiretinal membrane delamination height, X₅ - destruction of pigment epithelium, X₆ - high reflectivity of choroid, b₀= -12.0921, b₁= 0.38992, b₂= 0.143721, b₃= 0.3881, b₄= 0.008188, b₅= 0.340909, b₆= 0.057346. At Y≤0.5 predict low probability of preset level of VA, at Y ≥0.5 high probability of preset level of VA is predicted.

EFFECT: method enables high-accuracy determination of groups of patients with low and high visual predictions after cataract surgery by determining the probability of achieving VA.

1 cl, 2 dwg, 1 ex