Free Optical Calculators

Smart tools for smart opticians. Apni dukan ka kaam tez aur accurate banayein.

Transposition Calculator

Cylinder form ko Plus (+) se Minus (-) mein tabdeel karein.

Result (Nateeja)

SPH--
CYL--
AXIS--

Spectacle to Contact Lens Converter

Vertex Distance Compensation. Agar chashmay ka number zyada ho to Lens ka number kam hota hai.

*Calculation based on standard 12mm vertex distance.

Required Contact Lens Power

--

Lens ka number

Reading ADD Estimator

Estimate Reading Addition based on Age. (Umar ke hisaab se nazdeek ka number).

Estimated Addition

--

Note: This is just an estimate. Always perform subjective refraction.

How to Use These Optical Calculators?

Optical calculations can be tricky. Asaan Optics provides free tools for Opticians, Optometrists, and Eye Care Professionals in Pakistan to minimize errors and save time. Whether you need to convert a glasses prescription to contact lenses or transpose a cylinder sign, we have you covered.

What is Optical Transposition?

Optical Transposition (Transposition of Lens) ka matlab hai lens ki power ko ek form se doosri form mein likhna (Plus Cylinder to Minus Cylinder), bina uski optical value change kiye.

Formula for Transposition:

  • New Sphere: Add algebraic sum of old Sphere and Cylinder.
  • New Cylinder: Change the sign of the Cylinder (+ to - or vice versa).
  • New Axis: Add or subtract 90 degrees.

Spectacle to Contact Lens Conversion (Vertex Distance)

Jab chashmay ka number +/- 4.00 Diopters se zyada ho, to ankh aur lens ke darmiyan faasla (Vertex Distance) matter karta hai. Contact Lens ankh ke bilkul oopar lagta hai, is liye uska number chashmay se mukhtalif hota hai.

Aam taur par, Minus (-) power kam ho jati hai aur Plus (+) power barh jati hai contact lenses mein. Hamara calculator standard 12mm vertex distance use karta hai.

Reading Addition (Presbyopia) by Age

40 saal ki umar ke baad, nazdeek ki nazar kamzor hona shuru ho jati hai (Presbyopia). Neeche di gayi list ek general guide hai ke kis age mein kitna Reading ADD (Near Power) lagta hai:

Age (Umar) Approximate ADD
40-42 Years+1.00 D
43-45 Years+1.25 D
46-48 Years+1.50 D
49-51 Years+1.75 D
52-54 Years+2.00 D
55-57 Years+2.25 D
58+ Years+2.50 to +3.00 D

Want to manage these records digitally?

Asaan Optics app mein ye sab calculations automatic hain. Customer ka record save karein aur receipt WhatsApp karein.

Download App Contact Support