A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

Revathi is a front bench student . She is unable to draw the picture drawn on the blackboard. She got permission from the teacher and sat in the back row. What could be the kkdefect that Revathi is suffering from ? Draw the diagram, which shows the correction of the above defect ?

What is hypermetropia ? What are the causes of this defect ? How can this defect of the eye be corrected ?

Vikas who is having eyesight consulted an Opthalmologist. He suggested to use concave lens. Then what is the nature of defect Vikas suffering from ? How the defect will be corrected ?

Kavya can see distant objects clearly but cannot see objects at near distance. With what eye defect is she suffering ? Draw the diagrams showing the defected eye and its correction ?

Doctor advised to use a lens of - 2D for Karthik. By above statement what information you can give ? Explain the eye defect and also how you will correct it.