Jab aap kisi Eye Specialist (Mahir-e-Amraz-e-Chashm) ke paas jatay hain, to wo check-up ke baad apko aik parchi (Prescription) dete hain. Us par kuch ajeeb alfaaz likhay hotay hain jese OD, OS, SPH, CYL.
Is guide mein hum apko batayenge ke in sab ka kya matlab hai aur aap apna chashmay ka number khud kaise parh saktay hain.
1. OD aur OS ka kya matlab hai?
- OD: Ye Latin lafz "Oculus Dexter" se nikla hai, jiska matlab hai Right Eye (Dayin Ankh).
- OS: Ye "Oculus Sinister" hai, jiska matlab hai Left Eye (Bayin Ankh).
- OU: Matlab Both Eyes (Dono Ankhein).
2. SPH (Sphere) - Nazar ki Taqat
SPH ka matlab hai ke lens ki power kitni hai. Ye Diopters (D) mein naapi jati hai.
- Minus Sign (-): Agar number ke sath minus (-) laga ho (e.g., -2.00), to iska matlab hai apko nearsightedness (Myopia) hai. Yani apko dur ki cheezein dhundli nazar aati hain.
- Plus Sign (+): Agar plus (+) laga ho, to ye farsightedness (Hyperopia) hai. Yani apko nazdeek ki cheezon mein dushwari hoti hai.
3. CYL (Cylinder) aur Axis - Astigmatism
Agar apki prescription mein CYL likha hai, to apko Astigmatism hai. Iska asaan matlab ye hai ke apki ankh ki putli (cornea) bilkul goal nahi hai (shakal mein thori football jesi hai).
Axis: Cylinder ke sath hamesha ek "Axis" hota hai (0 se 180 degree tak). Ye batata hai ke cylindrical power kis angle par lagani hai.
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Open Transposition Calculator4. ADD (Reading Addition)
Ye aam taur par 40 saal se bari umar ke logon ke liye hota hai (Presbyopia). Ye hamesha Plus (+) mein hota hai, bhale hi wahan sign na laga ho.
Misaal ke taur par, agar ADD +2.00 likha hai, to iska matlab hai ke reading glasses ke liye dur ke number mein +2.00 jama karna parega.
| Eye | SPH | CYL | Axis | ADD |
|---|---|---|---|---|
| OD (Right) | -2.00 | -0.50 | 180 | +2.00 |
| OS (Left) | -1.75 | SPH | - | +2.00 |
Is example mein, patient ko dur ki nazar kamzor hai (Minus) aur reading ke liye Plus power chahiye.