Optical MathPregunta 94 de 100
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?
a.8 mm per lens
b.0 mm
c.16 mm per lens
d.8 mm total (4 mm per lens)
Explicación
Frame PD (geometric center distance) = A + DBL = 52 + 18 = 70 mm. Total decentration = frame PD - patient PD = 70 - 62 = 8 mm total, split as 4 mm per lens.
Practica las 100 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- Using Prentice's rule, how much prism is induced when a +4.00 D lens is decentered 5 mm?
- A -6.00 D lens must produce 3 prism diopters. How far must it be decentered (Prentice's rule)?
- Transpose -1.75 +1.25 x 060 to minus-cylinder form.
- 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?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con ABO (American Board of Opticianry) Certified Optician Exam · Cómo revisamos