Factors Influencing the Incidence of Glaucoma among Adult Patients in General Hospitals

1.1 Introduction

Glaucoma refers to a group of eye conditions that damage the optic nerve, often associated with increased intraocular pressure (IOP), which can lead to vision loss and blindness (Tham et al., 2014). Glaucoma is one of the leading causes of irreversible blindness globally, affecting millions of people, especially in developing countries. The World Health Organization (WHO) estimates that over 4.5 million people are blind due to glaucoma, which accounts for approximately 12% of global blindness cases (Quigley & Broman, 2006). Glaucoma is characterized by progressive optic nerve damage, often associated with elevated intraocular pressure (IOP), leading to visual field loss. Although it primarily affects older adults, it can occur at any age. The prevalence of glaucoma, particularly among adults in general hospitals, poses significant public health challenges due to its silent progression and often late diagnosis.

As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are Significance of the study, Scope of work, Research hypothesis and questions, Limitation of the study and Definition of terms.

1.2 Background of Study

Historically, glaucoma dates back to ancient times, with early descriptions of the disease found in Greek and Roman medical literature. The term "glaucoma" was first used by Hippocrates around 400 BC, derived from the Greek word "glaukos," meaning a cloudy or blue-green hue, which was likely a reference to the appearance of the eye in advanced stages of the disease (Weinreb & Khaw, 2004). However, it wasn't until the mid-19th century that glaucoma was more fully understood as a disease affecting the optic nerve, often linked to increased intraocular pressure (IOP).

The development of diagnostic techniques, such as the ophthalmoscope invented by Hermann von Helmholtz in 1851, revolutionized the ability to examine the interior of the eye and observe the optic nerve, which allowed for more accurate diagnoses of glaucoma (Finger et al., 2009). Later, advancements in tonometry in the 19th and 20th centuries helped measure IOP, solidifying the connection between elevated pressure and glaucoma risk. Treatments also began evolving, with surgical interventions and the introduction of medications to lower IOP emerging as primary methods of management.

In the context of general hospitals, glaucoma management became increasingly integrated into broader health systems in the 20th century. Hospitals became essential hubs for ophthalmic care, particularly in rural and underserved regions, where specialized eye care services were often limited. The World Health Organization (WHO) identified glaucoma as a major cause of blindness in the mid-20th century, bringing greater global attention to the disease. Since then, public health initiatives have aimed to increase awareness and improve access to early screening, particularly in low- and middle-income countries, where the burden of glaucoma is disproportionately high (Resnikoff et al., 2004).

Today, general hospitals serve as key points for diagnosing and treating glaucoma, particularly in developing countries where specialized eye care centers are scarce. The history of glaucoma care has thus shifted from rudimentary descriptions of the disease to a modern understanding that emphasizes early detection and the management of risk factors, particularly in environments where healthcare access is limited (Tham et al., 2014). Glaucoma is a group of eye conditions that lead to damage of the optic nerve, often due to high intraocular pressure (IOP), and is a leading cause of blindness worldwide. The condition has been referred to as the “silent thief of sight” because it typically progresses without noticeable symptoms until significant vision loss occurs (Quigley & Broman, 2006). Globally, approximately 80 million people are affected by glaucoma, with a significant portion residing in developing countries where access to comprehensive eye care is limited (Tham et al., 2014). Despite the availability of treatments to manage IOP and slow disease progression, the irreversible nature of the optic nerve damage underscores the importance of early detection and intervention.

In general hospitals, especially in resource-constrained settings, the burden of glaucoma is exacerbated by various factors, including late presentation, insufficient eye care services, and low public awareness. According to Leske et al. (2007), key risk factors for glaucoma include older age, family history of the condition, African ancestry, and certain systemic health conditions such as diabetes and hypertension. These factors contribute to the higher prevalence of glaucoma among certain populations, especially in Africa, where genetic predisposition and the limited access to screening services create significant barriers to effective glaucoma management.

General hospitals play a crucial role in providing primary and sometimes specialized care for patients who may not have access to private or specialized ophthalmic services. As the primary points of healthcare in many communities, they are integral to early glaucoma detection and treatment. Understanding the influencing factors that bring adult patients to these facilities with glaucoma is essential in shaping public health strategies to reduce blindness from this condition. Additionally, studies like that of Kyari et al. (2015) emphasize the critical need for improved glaucoma awareness and preventive eye care services, especially in hospital settings where most patients may present with advanced stages of the disease.

Therefore, in Nigeria where the research was carried out, the activities that was conducted is to know the factors influencing the incidence of glaucoma among adult patients in General Hospitals.

1.3 Statement of Problems

Investigation revealed that the incidence of glaucoma among adult patients in general hospitals is a growing concern due to its silent progression and the risk of irreversible blindness. One of the primary problems is the lack of early detection and timely treatment, which is critical for preventing optic nerve damage (Tham et al., 2014).

Additionally, socioeconomic factors, such as poverty and limited health education, influence the frequency of hospital visits and adherence to treatment plans, further exacerbating the incidence and progression of the disease (Quigley & Broman, 2006).

Furthermore, general hospitals, especially in rural regions, are often under-equipped to handle the comprehensive care needed for glaucoma patients. The absence of trained ophthalmologists, limited diagnostic equipment, and the high cost of treatment are barriers that contribute to the worsening of the condition among adults in these settings (Resnikoff et al., 2004).

1.4 Aim and Objectives of Study

The aim of the study is to examine the factors influencing the incidence of glaucoma among adult patients in general hospitals. In achieving this aim, the following specific objectives were laid out as follows:

1. To identify the socioeconomic factors that influences the incidence and management of glaucoma in adult patients.
2. To assess the level of awareness and knowledge of glaucoma among adult patients in general hospitals.
3. To investigate the relationship between patient adherence to treatment plans and the progression of glaucoma.
4. To determine the role of healthcare infrastructure, including availability of specialized equipment and trained personnel, in the diagnosis and treatment of glaucoma.
5. To explore the impact of regular eye screenings and early detection on the incidence of glaucoma among adult patients.

1.5 Research Questions

The study came up with research questions so as to be able to ascertain the above stated objectives. The specific research questions for the study are stated below as follows:

• What is the level of awareness and knowledge of glaucoma among adult patients in general hospitals?
• How do socioeconomic factors influence the incidence and management of glaucoma in adult patients?
• What role does healthcare infrastructure, including specialized equipment and trained personnel, play in the diagnosis and treatment of glaucoma?
• How does patient adherence to treatment plans affect the progression of glaucoma?
• What is the impact of regular eye screenings and early detection on the incidence of glaucoma among adult patients?

1.6 Research Hypotheses

In order to pursue the objective of this study, the following generalized statements have been designed to guide and aids in obtaining the result for the experiment to be conducted. For this work, the null hypothesis will be represented with H0 while the alternative hypothesis will be represented with hypothesis H1.

• H₀1: There is no significant relationship between socioeconomic factors and the incidence of glaucoma among adult patients in general hospitals.
• H₀2: Increased awareness and knowledge of glaucoma among adult patients are associated with a lower incidence of the disease.
• H₀3: Better healthcare infrastructure, including access to specialized equipment and trained personnel, is associated with a lower incidence of glaucoma.
• H₀4: Higher adherence to prescribed treatment plans is correlated with a reduced progression of glaucoma among adult patients.

1.7 Significance of Study

The findings of this research study will provide valuable insights into the factors influencing the incidence of glaucoma, which will enhance the understanding of the disease and its risk factors among healthcare professionals. The findings will also inform the development of targeted prevention and intervention strategies, contributing to better patient outcomes.

Additionally, the study will raise awareness among the general public regarding glaucoma's risk factors and the importance of regular eye examinations, potentially leading to earlier diagnosis and treatment. Policymakers will benefit from the study's recommendations, which will support the formulation of health policies aimed at reducing the incidence of glaucoma. Ultimately, this research will contribute to the broader field of ophthalmology by providing empirical evidence that can be used in future studies and healthcare practices.

1.8 Scope of Study

The scope of the research is focused on the factors influencing the incidence of glaucoma among adult patients in General Hospitals using Awka, Enugwu-ukwu and Onitsha as a case study.

1.9 Limitations of the study

During the course of this study, there were some problems encountered which stood as limitations to the research work. Some of the limitations include:

1. Time Constraint: The time frame given to accomplish this project was very short due to school academic calendar and it was carried out under pressure which made the researcher not to implement some necessary features.
2. Financial Constraint: Insufficient fund tends to impede the efficiency of the researcher in sourcing for the relevant materials, literature or information and in the process of data collection (internet, questionnaire and interview).
3. Initial Cooperation Delay from Respondents: A particular limitation of this work came as a result of the respondent refusal to offer their cooperation at the initial time they were contacted. This contributed in making the success of this research study difficult.

1.10 Definition of Terms

Glaucoma: It refers to a group of eye conditions that damage the optic nerve, often associated with increased intraocular pressure (IOP), which can lead to vision loss and blindness (Tham et al., 2014). It is considered a significant public health issue due to its prevalence and potential for severe outcomes if not detected and managed promptly.

Incidence: It denotes the occurrence of new cases of a disease or condition within a specific time period, typically expressed per a given population size (World Health Organization, 2020). In this study, incidence refers to the number of new glaucoma diagnoses among adult patients within a defined timeframe in general hospitals.

Adult Patients: It refers to individuals aged 18 years and older who seek medical attention in general hospitals. This demographic is critical for studying glaucoma as the risk of developing the condition increases with age (Morrison et al., 2019).