The problem involves calculating the power of the tear layer in a contact lens prescription for a mildly farsighted individual. The prescription is given as 1.25 D, with a near point of 29.0 cm, while a normal near point is 25.0 cm.
There is an ongoing exploration of the problem setup, with participants seeking clarification on how to combine the powers of the lenses and the implications of the near point on lens power. Some foundational questions are being revisited to aid understanding.
Participants note the assumption of an ideal correction and the relevance of the near point in determining the necessary lens power. There is also mention of the irrelevance of lens shape in the calculations.
The two lenses would bee a double convex (in the eye) and the contact would be a convex, right?Simon Bridge said:The tear+contact must make a compound lens with the power needed to correct eyesight with the stated near-point.
How do the powers of lenses combine?