2. Contact Lens Optics Dr. Mohammad Amiri , OD Department of Optometry ,Faculty of Rehabilitation Shahid Beheshti Medical Sceince University Vision Care of Menicon

16. Edge Appearance

20. Where is the optics?

40. Acanthamoeba

41. Hard Contact Lenses

58. Centration

60. Fluorescein Pattern

61. Fluorescein

62. Alignment

64. Wettability

68. GPC

69. Use of Contacts in Clinical Practice

72. Keratoconus

73. Keratoconus

75. Synergeyes

78. 3 lenses for most of the situations The most common cones : nipple and ovale

80. The more advanced is the cone , higher the slope (flattening) is.

82. Good center and periphery

85. Axial Edge Lift AEL AEL is the height that seperates the edge of the lens and the edge of the lens if this one wouldn’t have peripheral curves.  For known BC and total diameter the higher AEL is, the higher the flattening is

89. AEL Periph.curves ++ > AEL Periph.curves +

92. For a 8.70mm diam.

111. 5 Edge Lift +0.6 /+1.2 / -0.5 / -1.0

112. 1st lens: BC = K’ +0.30 mm Fitting: 1. Keratometry 2. BC 3. central Fitting 4. peripheral fitting 5. Centration/Mobility (=>Diameter) 6.Power Ex. 6.80/5.50  5.50 +0.30 = 5.80

113. BC plat OK / serré serré

114. EL périphérie très serrée EL Lent (-) périphérie serrée EL standard Périphérie ok EL rapide (+)

115. Mobility Look for enough mobility to insure enough tear flow Mobility ++ Mobility -- increase diameter Decrease diameter decrease BC Flatten BC 0 decrease l’Edge Lift increase l’Edge Lift

117. 1st lens = Km - 0.30 mm Fitting : 1. Keratometry 2. BC 3. central fitting 4. peropheral fitting 5. Centration / mobility 6. Power Ex. 6.80/5.50  6.15 - 0.30 = 5.85

121. 5 Edge Lift +0.6 /+1.2 / -0.5 / -1.0

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