Dr Rajiv Desai
An Educational Blog
REFRACTIVE ERROR
________________ REFRACTIVE ERROR: ________ Prologue: Way back in 1973 when I was 12 years old and studying in 7th standard, I noticed that I could not read black-board from last bench. Initially I thought that everybody must be finding difficult to read black-board from last bench but it was not the case. Soon I visited eye doctor who found that I have refractive error and he prescribed -4 (minus 4) eyeglasses for me. Since then I have been wearing glasses. Refractive errors are usually present in the childhood and continue in the adult life. Unfortunately, they are not given much importance in our society which is evident from the fact that there is no effective system of pre-school visual examination of children either in the government sector or in the private sector. The earth was formed 4 billion years ago. Society has been around for about twenty thousand years. Spectacles […]
Closed-Circuit Television (CCTV)
Closed-Circuit Television (CCTV): ________ CCTV pictures showing Al Qaeda’s terrorists Mohamed Atta and Abdulaziz Alomari boarding a 6:00 a.m. flight from Portland to Boston’s Logan International Airport on September 11, 2001. _____ CCTV footages of 2015: _______ Prologue: In the past people didn’t misbehave because they thought God was watching them. Today we’ve replaced an all-seeing God with the glassy eye of the CCTV camera. A CCTV camera can operate 24 hours a day, seven days a week, and 365 days a year without a toilet break or lunch. It does not need a holiday, maternity leave and rarely goes sick. There were 25 million CCTV cameras in operation worldwide, with 2.5 million in the UK in 2002 but today the figure is doubled. Practically every major city now boasts a CCTV system aimed at, among other things, preventing, detecting and reducing crime. Increasingly these developments are mirrored in villages, […]
