diff --git a/src/OpenGl/OpenGl_ShaderManager.cxx b/src/OpenGl/OpenGl_ShaderManager.cxx
index 842ce3546f..bd3635bedf 100644
--- a/src/OpenGl/OpenGl_ShaderManager.cxx
+++ b/src/OpenGl/OpenGl_ShaderManager.cxx
@@ -1684,7 +1684,7 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_Sh
           EOL"{"
           EOL"  vec4 aColorL = occTexture2D (uLeftSampler,  TexCoord);"
           EOL"  vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
-          EOL"  if (int (mod (gl_FragCoord.y + 1.5, 2.0)) == 1)"
+          EOL"  if (int (mod (gl_FragCoord.y - 1023.5, 2.0)) != 1)"
           EOL"  {"
           EOL"    occFragColor = aColorL;"
           EOL"  }"
@@ -1707,7 +1707,7 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_Sh
           EOL"{"
           EOL"  vec4 aColorL = occTexture2D (uLeftSampler,  TexCoord);"
           EOL"  vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
-          EOL"  if (int (mod (gl_FragCoord.x + 1.5, 2.0)) != 1)"
+          EOL"  if (int (mod (gl_FragCoord.x - 1023.5, 2.0)) == 1)"
           EOL"  {"
           EOL"    occFragColor = aColorL;"
           EOL"  }"
@@ -1730,8 +1730,8 @@ Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_Sh
           EOL"{"
           EOL"  vec4 aColorL = occTexture2D (uLeftSampler,  TexCoord);"
           EOL"  vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
-          EOL"  bool isEvenX = int(mod(floor(gl_FragCoord.x + 1.5), 2.0)) == 1;"
-          EOL"  bool isEvenY = int(mod(floor(gl_FragCoord.y + 1.5), 2.0)) != 1;"
+          EOL"  bool isEvenX = int(mod(floor(gl_FragCoord.x - 1023.5), 2.0)) != 1;"
+          EOL"  bool isEvenY = int(mod(floor(gl_FragCoord.y - 1023.5), 2.0)) == 1;"
           EOL"  if ((isEvenX && isEvenY) || (!isEvenX && !isEvenY))"
           EOL"  {"
           EOL"    occFragColor = aColorL;"