K10 Karakteristik Fisik Lensa Ophtalmic

KLINIK OPTIK II ( Dasar ) Novi Himawan , R O

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KARAKTERISTIK FISIK Lensa Opthalmic

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Physical characteristic –Density –Hardness –Impact resistance 3

Physical characteristic – Density – Hardness – Impact resistance

• Kepadatan Bahan lensa semakin tinggi index bias lensa maka lensa akan semakin padat bahannya.

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Physical characteristic – Density – Hardness – Impact resistance

• Kekerasan Bahan semakin keras bahan bahan maka semakin baik kualitasnya.

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Definition • Scratch = Visible surface damage – Effect on transmitted or reflected light – Importance of contrast (observation conditions)

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Physical characteristic – Density – Hardness – Impact resistance

• Daya tahan terhadap benturan

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Standart pengukuran impact resistance Two Standards

F.D.A = Impact resistance

American market

100 Newton = static resistance

European market + Japon+?

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Impact resistance: FDA standard

Static resistance: 100 Newton standard

m=16g h=1.27m

• Energy imposed test • Energy of rupture >200 mJ (= 20 gm) • Statistics: A.Q.L 6.5

m=10kg

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Load imposed test Load to rupture > 100N Deflection < 4.5 mm A.Q.L 0

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