15th International Congress on Vision Science and Eye August 10 -11, 2017 London, UK

Biography:

Prof.Antonio Carlos Centelhas is head of ophthalmology of CRMED Ministery of Health, Nise da Silveira Hospital , Rio de Janeiro, Brazil Ex- Professor of ABC University , SãoPaulo, Brasil and Gama Filho University, Rio de Janeiro, Brazil. Prof. Centelhas is international advisory board Of Delhi Journal of Ophthalmology,New Delhi, India. Panelist in many Congress and Universities (EUA)

Abstract:

The TransPRK( transepithelial photo refractive Keratectomy ) by Amaris 750S a Schwind Thecnology is a refractive procedure  with no-contact surgery. Corneal epithelium is removed by the laser  without manual interference.It brings more accurity and perfect deepithelization.This innovative laser system delivers an unsurpassed repetition rate of 1050 HZ and consequently an extremely short ablation time of just 1.3 seconds per dioptre. That means even greater safety and comfort for the patient. The risk of  the córnea drying out is minimised, and the length of time the patient has to fixate on the green ligth is reduced. The Smart Pulse tecnology use a gemetrical model based on a fullerene structure other, importante instrument of security is the integrated contact free optical pachymetry that provides precision information about the thicness ofthe córnea throughout the entire duration of the treatment.
The 7D eye impresses a apart from the linear movements ( 1st and 2and dimentions).Compensations of the eye rotation around its optical axis.

Method

We treated and studied in two years 621 eyes of 336 patients , 125 males and 211 females.The average degrees of spherical refraction was -2.75 DE and cylindrical refraction was –125DC. We use 1% tetracaine hydrochloride as anesthesia and mitomicin-c 0,01% for 25 minutes or more and contact lens after the application. Drops of moxifloxacin hydrochloride 0,5 for antibiotic therapy.In the postoperatory we use moxifloxacin hydrochloride 0,5 4 drops a day for 7 days, trometamol cetorolac 0,45% 4 drops a day for 7days and carmellose sodium and sodium hyaluronate for 1 month.
 
RESULTS

We had 96,3 % with 20/20 in the end of two eyes of study and 6 eyes presented a litlle manifestation of haze.93% had epitelial regeneration in 3 days after surgery and all patients in 5 days. 96,3 % showed  a spherical refraction target of 0,52 and a cylindrical refraction of 0.5 degrees. The corneal architectural structure becames preserved and we have to pay attention when we have diameters below 9.5 mm which may occur overcorrection in the results. The results modified with a litlle between 12 to 36 months. The dry eye occured in 73% of patients in the first month and kept with the same incidence of all population after
3 months of the surgery.


Conclusion

The TRANSPRK  showed  an ecxelent and safe procedure  with 96,2% of  good results of myopia and astigmatism .We need to observe the development of dry eye in the three months of pos –operatory.
 

Biography:

John Barbur is a Professor of Optics and Visual Science at Applied Vision Research Centre at City, University of London. He combines fundamental vision science with applied and clinical research, which underpins a long record of research achievement and wider impact. He works on camouflage for the royal signals and radar establishment led to insights into the processing of luminance and color signals that have important applications in color vision assessment. These and other studies led to the development of several Advanced Vision and Optometric Tests (AVOT), initially for research studies and later for more precise assessment of vision in visually-demanding environments such as aviation and rail transport. The CAD (Color Assessment and Diagnosis) is now used throughout the world to assess pilots, firefighters, seafarers, police officers and air traffic controllers.

Abstract:

Significant advances in understanding the genetics of color vision make it possible to account for a great deal of the observed variability in both normal trichromats and in congenital color deficiency. Advancements in shading evaluation systems additionally yield within subject variability and hence more accurate assessment of both red/green (RG) and yellow/blue (YB) chromatic sensitivity with reliable classification of the subject's class of color vision (i.e., normal trichromatic color vision, deutan-, protan- or tritan-like and acquired deficiency). The severity of color deficiency can also be quantified more accurately with reliable separation of RG and YB loss leading to clear distinction between congenital and acquired loss. A third element that has contributed to the recent flurry of interest in color vision is the availability of reliable data that describe the effect of normal aging on RG and YB chromatic sensitivity. Such advances have made color vision assessment more attractive as a diagnostic tool for early detection of diseases of the retina such as age-related macular degeneration (AMD) and glaucoma and systemic diseases that can

also affect visual function such as diabetes. The outcome of conventional tests of color vision will be reviewed and data that describe the variability observed within normal trichromats and in subjects with congenital deficiency will be presented. This improved understanding has significant effects on color assessment and the establishment of minimum color vision requirements within visually-demanding occupational environments. Studies that led to color vision changes as a result of normal ageing and the application of these to early detection of acquired loss of chromatic sensitivity will be discussed. Finally, results of extensive, clinical studies designed to detect the earliest changes in color vision in diabetes, glaucoma and AMD will also be presented.