biology·NCERT Class 11·Sensory Reception (NCERT Chapter 21)
Human Eye & Defects
Easy+70 XP
Myopia, hypermetropia, presbyopia, astigmatism — four defects, four different fixes. Adjust the lens curvature in 3D and watch the focal point land on (or miss) the retina.
›Near point: 25 cm (normal); far point: infinity.
›Accommodation: ciliary muscles change lens shape to focus near/far objects.