Optical MathPregunta 100 de 100
A lens has a front curve of +8.00 D and needs +2.00 D total power. What back curve is required (thin-lens approximation)?
a.+6.00 D
b.-6.00 D
c.+10.00 D
d.-2.00 D
Explicación
Total power = front + back. Back = total - front = +2.00 - (+8.00) = -6.00 D. The back surface must be ground to -6.00 D to achieve the +2.00 D lens.
Practica las 100 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- A frame has an A measurement of 52 mm, DBL of 18 mm, and the patient's PD is 62 mm. What is the total decentration for both lenses combined?
- With a 34 mm effective diameter and 4 mm per-lens decentration, what is the approximate minimum blank size?
- A patient is refracted at a 12 mm vertex with -10.00 D, but the frame sits at 16 mm. Which way does the effective power change, requiring compensation?
- What is the combined horizontal prism when the right lens gives 2 prism diopters base out and the left lens gives 1 prism diopter base out?
- Compute the spherical equivalent of +3.00 -2.00 x 090.
- How much vertical prism imbalance exists if the reading point is 8 mm below the OC in a +2.50 D right lens and a +1.00 D left lens (Prentice's rule)?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con ABO (American Board of Opticianry) Certified Optician Exam · Cómo revisamos