## 1 Introduction
### Literature Review  
Studies show that seventy percent of the research studies related to the evaluation of websites providing health information conclude that the quality of such websites is a major concern [24]. Various studies have been conducted for the assessment of OHI on different medical conditions such as lupuserythematosus [10], diverticulitis [25], breast cancer treatment [26], childhood epilepsy [27], endoscopic retrograde cholango pancreatography procedure (ERCP) [28], anxiety disorder [29], cataracts [30] and childhood depression [31]. In Reference [10], the authors search the term'systemic lupus erythematosus' through Google, Bing and Yahoo and collect first 25 links in each search engine and assess only 25 unique websites (obtained through exclusion criteria) by evaluators. All websites are rated (No: does not fulfil criterion (1 point) to Yes: fulfils criterion (5 points)) through 16 questions of DISCERN checklist which has maximum score of 80. The authors find that none of the websites is categorized as 'excellent website' because none achieve a DISCERN score above 66. Among the 26 websites, 6 websites are poor and the content of 2 websites is very poor. Similarly, the authors of Reference [27] investigate the term 'Childhood Epilepsy' through Google and only 42 links are included in the study after removing advertisements, health forums, duplicated websites and personal experience websites. The assessment is carried out by two different groups through DISCERN tool. Hence, only 9.6% of the websites are of good quality while 26.2% are marked unreliable. Furthermore, 42.8% of the websites are unable to expatiate treatment choices effectively, whereas only 7 out of 42 websites provide clear information and access to additional sources. Furthermore, the authors conclude that source attribution in all websites is poor. The quality of 80% websites has serious deficiencies [32]. In study of ERCP, the authors examine the search term 'ERCP' in top three search engines [28]. A total of 60 websites are retrieved and 24 unique websites (excluding the websites with visual content, websites with completely scientific articles at advanced level or those which did not contain relevant information) are selected for study. Authors demonstrate that the websites are unable to provide proof of reliable source of information and the date on which the information is described. Furthermore, none of the websites achieve 5 out of 5 rating in all indicators of DISCERN. The included websites also fail to describe the effect for health consumers and whether the additional treatment information is available or not. In Reference [29], Google, Yahoo and MSN search engines yield a total of 540 websites for anxiety disorder, only 67 websites are found eligible for the study. All the websites are categorized as per its affiliation. The result shows that 29 out of 67 websites provide poor quality of information, 15 websites are of good quality and only 3 websites produce excellent quality of information on anxiety disorder.  
In References [10; 25; 26; 27; 28; 29; 33; 34; 35], it is found that inconsistent, unreliable and unauthentic information co-exist with actual information. Since the Internet has a great possible impact on the treatment decisions of patients; it is, therefore, very significant that patients access accurate and reliable OHI to bring down the risks of Internet-based detrimental clinical decisions [36]. In addition, studies have repeatedly showed that OHI are being developed to a degree that is too complex for most web users [19].  
Therefore, this paper focuses on evaluating the quality and readability of OHI related to high BP.