Samina Jehangir ( Department of Ophthalmology, Allama Iqbal Medical College, Services Hospital, Lahore. )
Dry eye syndrome was studied in 30 Pakistani patients, 20 males and 10 females ranging from under 20 to over 60 years. The visual acuity at the time they first reported was 6/60(20/200) or less in 21(70%) patients and 6/18(20/60) or above in nine (30%). Fifteen (50%) patients were hopelessly blind and another six (20%) were with very poor prognosis. Only nine (30%) patients had a chance to escape impending blindness (JPMA 40: 66, 1990).
Absence of tears causes keratinization of the corneal and conjunctival epithelium. The precorneal tear film consists of an outer lipid, middle aqueous and inner mucin layer1. The outer lipid layer retards evaporation of aqueous layer. The middle aqueous layer provides atmospheric oxygen to the corneal epithelium. It has antibacterial substances, provides smooth optical surface and washes away debris. The inner mucin layer converts the corneal epithelium from a hydrophobic to a hydrophilic surface. In addition to adequate amounts of aqueous tears and mucin, a normal blink reflex2, congruity between the external ocular surface and the eyelids and healthy epithelium are necessary for effective resurfacing of the cornea by the precorneal tear film3. Once the conjunctiva is scarred and cornea is opaque the chances of successful restoration of vision are very slim4. As the most productive area of health care is that of prevention, this study was conducted for promoting interest in the prevention of blindness in our country.
MATERIAL AND METHODS
This study of 30 randomly selected patients, 20 (66.6%) men and 10 (33.4%) women took 6 months. Twenty two (77%) of the patients were over 40 and 8 under 40, one being a child of 12 (Table 1).
Considering dry eye a common condition, all patients complaining of red, burning, itchy and uncomfortable eyes were suspected for KCS (Keratoconjunctivitis Sicca). The strategy in history and examination was to: (1) identify patients with lacrimal disorder, (2) locate the part of system involved (secretion, distribution, excretion), (3) assess the functional impact on corneal integrity and health of external eye and (4) determine the etiology. General medical history was obtained. External examination and slit lamp examination of anterior segment was carried out for evaluation of lower lid tear meniscus, precorneal tear film5 and presence or absence of complications. Schirmer’s test and tear film break up time were carried out to evaluate relative deficiency of aqueous or mucin6.
Prevention of ocular disorders includes both elimination of hazards to the eyes (e.g, accident prevention, sterility of ophthalmic solution) and recognition of disease states at a time when improvement, containment, or cure can be achieved with proper management. The updated estimates of world blindness produced by the WHO in 1987 showed that there are between 27 and 35 million blind people in the world with a visual acuity of less than 3/60 and 41 to 52 million with a visual acuity of less than 6/60. From the available data it is noted that a 1981 estii1iate of blindness in Pakistan gave a prevalence rate of 2.4%, resulting in a total of 1,447,400 people with a visual acuity of less than 1/60 in which cataract, trachoma, infections and corneal scarring accounted for 85%7. This study conducted in 1988 shows that many of these diseases are still prevalent in Pakistan. Sixteen (53%) patients with ocular diseases like chronic conjunctivitis, trachoma, marginal blepharitis and pterygium can be prevented from turning blind if ocular care is provided at an early stage. Adequate safety should be provided against industrial hazards. Measures are to be taken against malnutrition as treatments available, either medical or surgical, are unsatisfactory after the complications set in. As pointed by Professor Barrie Jones, there are four basic requirements for community ophthalmology to work, defining community ophthalmology as that “applied to eliminating avoidable blindness and improving the eye health of communities” and avoidable blindness as “blindness that could be either prevented or cured within the constraint of resources that could reasonably be made available for that purpose”. 7 Firstly, selected skills of basic ophthalmology should be available to all those in need wherever they lived requiring the training and utilizing of all relevant categories of manpower not just the training of ophthalmologists. Secondly, community ophthalmology should be closely integrated with the primary health care system and to develop and remain in close integration with the academic and referral centers of ophthalmology. Thirdly, ophthalmology services should deliver appropriate balance of preventive and curative measures aimed at the main blinding and disabling eye disease burden in the community — as defined by epidemiologically sound methods. Fourthly, the resources be allocated and distributed according to epidemiologically determined priorities based on the geographic distribution of people, disease burden and service deficits.7 Pakistan is a vast country, and efforts have to be coordinated in order to improve the eye health of Pakistanis. It would be appropriate if the domain of ophthalmology and community medicine make joint efforts in eliminating avoidable blindness and improving the eye health.
1. Aquavella, J.V. and Rao, G.N. Diagnosis and management of the dry eye. Perspect. Ophthalmology, 1977; 1: 248.
2. Doane, M.G. Interaction of eyelids and tears of corneal wetting and the dynamics of the normal human eyeblink. Am. J. Ophthalmol., 1980; 89 : 507.
3. Farris, R.L., Stuchell, R.N. and Mandel, 1.D. Basaland reflex human tear analysis. I. Physical measurement: osmolarity, basal volumes, and reflex flow rate. Ophthalmology (Rochester), 1981; 88 : 852.
4. Jones, D.B. Prospects in the management of tear-deficiency states. Trans. Acad. Ophthalmol. Otolthyngol., 1977; 83 : 693.
5. Jordan, A. and Baum, J. Basic tear flow does it exist? Ophthalmol¬ogy (Rochester), 1980; 87: 920.
6. Sharpiro, A. and Merin, S. Schirmer test and break-up time of tear film in normal subjects. Am. J. Ophthalmol., 1979; 88: 752.
7. Johns, A.W. Role of International Non-Governmental Organiza-tions and Eye Health in Developing countries PakistanJ. Ophthal¬mol., 1988; 4: 123.