醫(yī)學(xué)課件：接觸鏡的檢測(cè) 接觸鏡與現(xiàn)代生活

1、Contact lens and modern vision life,WENZHOU MEDICAL COLLEGE,1,2,CL and modern vision life,CL and Reading CL and Dry eye CL and Sport CL and UV etc,3,Chapter 1 CL and ReadingCL and computer related vision problems,4,Computer Vision Syndrome,Vitality and variability Blinking Brightness, Contrast Sensi

2、tivity Reading: fixation and saccadic Computer: saccadic, pursue, fixation,5,1、vision problem,Near blurred vision Slowness in accommodate Blur in the distance after near work Diplopia (double vision) Color vision problem,6,2、Eye physiology,Eye burning Dry eye Redness Blinking anomalies Contact lens

3、discomfort eye pain Eye strain: exophoria,7,3、Glare, flare and sensitivity,Glare:眩光 Flare:閃光 sensitivity:對(duì)光敏感,8,4、CL and Accommodation,Distance:40cm Normal eye Age:17y Accommodation=？,9,Distance:40cm Presbyopia Age:45y Acc Amp=3.00D Acc,CL and Accommodation,10,Spectacle and Accommodation,-1 A g = _

4、s (1- 2dP) P=-6.00D, d=15mm, s=25cm Acc:? Acc=3.38D,11,CL and Accommodation,s=25cm Acc=? Acc=4D,12,5、CL and Convergence,Myopia: Spectacle Contact lens Hyperopia Spectacle Contact lens,13,Chapter 2: Contact lens & dry eye,Dry eye is a chronic, multifactorial condition characterized by disturbances in

5、 the tear film and the ocular surface.,14,Reason,Dry eye can be caused by deficiency of any one or more of the tear film components, or can be a component of systemic diseases.,15,prevalence,Moss noted that after age 59, prevalence more than doubled. A separate Australian study of 926 subjects age 4

6、0 and older found generally higher prevalence of dry eye in women,16,Treatment of Dry eye,Behavioral and environmental modification Take breaks while reading Lowering the computer monitor to decrease lid aperture Humidification of the environment warmer,17,Treatment of Dry eye,Nonpreserved tear subs

7、titutes or gels Medications Surgery,18,Chapter 3 CL and sports,19,Benefits of CL,Increased peripheral vision Reduced spatial distortion More real world visual information Improved depth perception Move with the eyes even during activities,20,Benefits of CL over spectacles,No reflections, fewer abber

8、rations Do not slip down the nose, fall off, fog up or become covered with sweat, rain, dust sunglasses or protective eyewear can be worn over CL Psychologically, less encumbering than spectacles,21,CL and sport vision,Vision field Prism Glare,22,1、Vision field,23,2、CL and Convergence,ie(Pr+Pl) Lr=

9、2s,24,3、Glare,25,4、CL and water sports,Ensure optimal safety and performance Lens loss is frequent Complications are rare,26,CL and water sports,27,Fitting lenses for water sports,Avoid rigid lenses Fit larger diameter lenses Consider thicker lenses Consider spherical lenses for toric patients Recom

10、mend disposable lenses Carry spare lenses,28,Fresh water fitting,Consider looser fit（低滲） Eye rinse upon leaving water Remove, clean and disinfect lenses Consider goggles（護(hù)眼鏡）,29,Salt water fitting,Not necessary to fit steep Remove, clean and disinfect lenses after lens mobility returns Consider gogg

11、les,30,5、Dynamic sports,Dynamic sports may be defined as those which involve a great amount of body movement and speed. Cycling（騎車） Running Tennis（網(wǎng)球） Skiing（滑雪）,31,CL for Dynamic sports,Centre lens precisely（正好） Minimal movement without blur upon blinking Stability in extreme positions of gaze and

12、body orientations Not consider at RGP lens,32,CL for indoor sports,Dryness may be a problem Reduced glare and contrast sensitivity Consider the use of lens lubricant（潤(rùn)滑劑） Recommend disposable or freuent replacement lenses,33,6、Educating,Lens handling Manage ocular emergencies contact lens care kit（工

13、具） in medical supplies,34,Chapter 4 CL and Work Environment,35,Chemical Hazards,Gases:氣體 Fumes:煙 Vapours:蒸氣 Liquids:液體,36,37,Fumes & Vapours,Capable of binding to, and being absorbed into, Contact lens,38,Fumes & Vapours,CL create barrier effect CL should not be used as a substitute for protective e

14、yewear,39,Mechanical Hazards,No CL is a substitute for appropriate eye protection Use eye or face protectors conforming to an appropriate industrial standard,40,Physical Hazards,Radiation Barometric pressure Temperature Humidity（潮濕） Wind Air pollution acceleration stresses Cosmetics,41,Ionizing（電離） radiation,X-ray and gamma rays Alpha particles Beta particles,42,Non-ionizing