This document discusses different types of ophthalmic lenses, including: - Concave and convex spherical lenses which can be combined with cylindrical lenses - Compound lenses that combine spherical and cylindrical corrections - Bifocal lenses that provide distance and near vision corrections - Progressive lenses that gradually change the prescription from distance to near without a visible line - Lens materials like CR-39, hard coat, glass, Trivex, and polycarbonate and lens coatings like anti-reflection and photochromic coatings.

1. TYPES OF
OPHTHALMIC LENS
BY SUJIT KUMAR
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2. (-) CONCAVE/(+)
CONVEX
• COMPOUND NO =
SPHERICAL+CYLINDRICAL
• +1.00/+1.00*180
• -1.50/-2.00*90
• CROSS COMPOUND=
SPHERICAL+CYLINDRICAL
• +1.00/-1.00*180
• -1.50/+2.00*90
• BY FOCAL LENS
• R +2.00/+0.50*90
• L +2.00/+.75*180
• ADD +2.00 DS
SPHERICAL (+) , (-)
CYLINDER (+) , (-)
EG :- +1.00 DS/+1..00*90
+1.00 DS/-1.00*180

3. TYPES OF BIFOCAL LENS
DISTANCE -1.00
+1.00
NEAR +2.00 +2.00

4. TYPES OF PROGRESSIVE
1. DIGITAL 2. SMART DIGITAL
DIST
ENTER
MEDIATE
NEAR
SHORT
SPACE
SHORT
SPACE
+1.75
+2.00
+2.75
+3.00
SHORT
SPACE
SHORT
SPACE
+2.00
+2.25
+2.50
+2.75

5. • FIBRE CR 39 1.49
• HARD COT (HC) :- NO COLOUR CHANGES
• GLASS 1.52
• UN COT (NC) :- COLOUR CHANGES
• TIN TABLE :- COLOUR CHANGES
• ARC ANTI REFLECTION COATING
• BLUE CUT COATING
• PHOTOCHROMATIC :- LIGHT CHANGES
• POLYCARBONATE 1.58 :- DON’T BROKEN EASILY
QUALITY OF LENS