K10a Pengantar Karakteristik Lensa Ophtalmic

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KLINIK OPTIK II ( Dasar ) Novi Himawan , R O

1

KARAKTERISTIK Lensa Opthalmic

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Mengapa perlu mempunyai pengetahuan ttg bahan & desain lensa • Saat ini, begitu banyak – Pilihan bahan lensa – Pilihan harga ( qualitas ) dengan index sama – Distributor

– Janda – janda muda 3

A LENS IS A COMPLEX SYSTEM TOP COAT

AR COATING

HARD COAT

SUBSTRATE PRIMER

DYES 4

Bahasan hari ini • Sejarah bahan • Syarat-syarat lensa opthalmic • Proses pembuatan lensa

5

Bahasan hari ini • Sejarah bahan • Syarat-syarat lensa opthalmic • Proses pembuatan lensa

6

HISTORY First optical polymer (PMMA) :1934 PMMA lens : 1940 1950’s : introduction of PPG CR39 polymer Until 80's : One material represents 95% of the market From 80's to now : Multiplication of materials • High index (1.55, 1.6, 1.65...) • Thermoplastic ( Polycarbonate ) • Photochromic Organic ( Transitions ) • New technologies

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Bahasan hari ini • Sejarah bahan • Syarat-syarat lensa opthalmic • Proses pembuatan lensa

8

Syarat-syarat bahan lensa • Optical properties – Index refraksi – Nilai dispersi / abbe number – Homogenity – Tranparancy

• Physical characteristic – Density – Hardness – Impact resistance 9

Bahasan hari ini • Sejarah bahan • Syarat-syarat lensa opthalmic • Proses pembuatan lensa

10

Organic lens: Molding technics Casting molding

Injection

(Coulée)

(Injection)

Thermoset

Thermoplastic

ex: CR39

ex: Polycarbonate

11

Casting Monomer Catalyst

casting

Polymerization Disassembling

12

Injection Polycarbonate pellets Heaters

Piston

Mold Gate

Molten plastic

Turning screw

13

Semoga Anda sekalian tidak sedang mengalami seperti ini

14

Terima kasih 15

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