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CONTACT LENS WEAR WITH DIFFERENT WATER CONTENT INDUCES DRYNESS

CONTACT LENS WEAR WITH DIFFERENT WATER CONTENT INDUCES DRYNESS. AUTHERS: DR.NAYANA AGRAWAL DR.AMIT PATEL DR.DIPALI SATANI (AIOS Membership No : SO8957)

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CONTACT LENS WEAR WITH DIFFERENT WATER CONTENT INDUCES DRYNESS

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  1. CONTACT LENS WEAR WITH DIFFERENT WATER CONTENT INDUCES DRYNESS AUTHERS: DR.NAYANA AGRAWAL DR.AMIT PATEL DR.DIPALI SATANI (AIOS Membership No : SO8957) DR.SHWETAMBARI SINGH (AIOS Membership No : S12646) E-POSTER CODE No :- FP414

  2. INTRODUCTION Dry eye is a disorder of the tear film due to tear deficiency or excessive tear evaporation which causes damage to the interpalpebral ocular surface and is associated with symptoms of ocular discomfort. Now a days contact lenses are the first choice for correction of refractive error among young people. Recent studies shows that approximately 50% of contact lens wearers report experiencing dry eye symptoms. So AIM of our study is : 1.To study prevalence of dry eye induced by contact lenses. 2.To compare dryness induced by contact lenses of different water content.

  3. Dry eye and alterations of the tear film in contact lens wearers are associated with the 1. Reduction in functional visual acuity , 2. Reduction in wearing time and 3. Increased risk of ocular surface desiccations , bacterial binding and Infection.

  4. MATERIALS Stop watch Schiermer tear strip Slit lamp Biomicroscope B&L Keratometer

  5. The contact lenses used were 2. Quarterly lenses : BASE CURVE : 8.6 mm DIAMETER: 14.00 mm WATER CONTENT : 48 % CENTER THICKNESS : 0.08 mm MATERIAL :Hefilcon A • Yearly lenses BASE CURVE : 8.6 mm DIAMETER : 14.00mm WATER CONTENT : 42% CENTER THICKNESS : 0.08mm MATERIAL: Hefilcon A

  6. METHODOLOGY A prospective study was carried out on 23 patients. Schiermer test was done prior to check total tear secretion After base-line pre corneal tear film measurements, All the subjects were fitted with soft Contact lenses, first with yearly lenses, and on next day monthly lenses were fitted and their evaluation was done on Slit Lamp for the assessment of the proper fit of the contact lens. Tear thinning time (TTT) measurements were made with BAUSCH & LOMB one position keratometer after a lens being worn for 4 hours and the time taken for the reflected mire image to distort or break up after a blink is recorded.

  7. The subject was instructed to blink once and then to refrain from blinking while the observer watches for distortion in the reflected mire & records the elapsed time between the blink and the observation of distortion in the tear film. To prevent the subject from experiencing reflex tearing and discomfort due to prolonged eye opening, measurements were finalized after 60 seconds of break interval.

  8. RESULTS Graph 1 shows the tear thinning time measured in right eye without contact lens, with yearly contact lens (42%) and with quarterly contact lens (48%) (p=0.023). The mean value of tear thinning time without contact lens is noted as 12.80, that with yearly contact lens are 7.02 and that with quarterly wear are 6.06. The graph indicates that with the increase in water content the rate of induced dryness also increases.

  9. Graph 2 show the tear thinning time noted in left eye without contact lens, with yearly contact lens and with quarterly contact lens wear (p=0.0724). The mean values of TTT calculated for subject without contact lens, with yearly contact lens and with quarterly contact lens wear are 14.37, 6.24 and 5.52 respectively.

  10. Graph 3 shows the tear thinning time data of 50 eyes when measured without contact lenses, with yearly contact lens wear and quarterly contact lens wear (p=0.0450). The mean values of TTT calculated for subject without contact lens, with yearly contact lens and with quarterly contact lens wear are 13.56, 6.62 and 5.78 respectively

  11. DISCUSSION As clearly evident from the results, the mean values of tear thinning time as calculated for without contact lens wear is 13.56, with yearly contact lens wear (water content-42%) is 6.62 and with quarterly wear (water content-48%) is 5.78, with the increase in water content of the contact lens material, the rate of contact lens induced dry eye increases which is significantly noted in the tear thinning time values measured with the keratometer. For known contact lens induced dry eye patients, the management options include either shifting the already using conventional contact lens wearers to disposable modality (Silicone Hydro gels) or keep them on material with low water content and/or reduced the wearing time.

  12. CONCLUSION The rate of occurrence of contact lens induced dry eye ismore in high water content monthly lenses than in low water content yearly lenses. Tear film evaluation is at most important in contact lens patients with respect to its tear film integrity and stability. TTT can be the line of choice for tear film stability assessment in contact lens patients if higher order instruments like “Tearscope” are not available.

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