We can start from the position of the eyes, and when the sight of the eyes deviates, it can be simply distinguished as:
1. Implicit offset is also known as oblique
2. Dominant deviation also known as strabismus
We can use 稜鏡 lenses as a tool for correction, relief and training when measuring. When the above two conditions occur, it may lead to frequent blinking, eye burning, tearing, headache, double vision, inability to last close reading and inattention, etc.
Before getting glasses or contact lenses, be sure to consult an optometrist (student) or an ophthalmologist, and go through a detailed optometry check to ensure your own visual quality.