Corneal Diseases:  Keratoconus and Dry Eye Disease

The cornea is the transparent, avascular, dome-shaped anterior surface of the eye that provides most of the eye's refractive power and plays a crucial role in focusing light onto the retina. Healthy corneal structure, transparency, smoothness and hydration are essential for good visual acuity and quality of vision. Corneal diseases can affect one or more of these properties, resulting in blurred vision, irregular astigmatism, glare, photophobia, pain, foreign-body sensation and, in severe cases, permanent visual impairment. Common corneal disorders include keratoconus and other corneal ectasias, dry eye disease, microbial keratitis, corneal dystrophies, degenerations, recurrent corneal erosions, exposure keratopathy and corneal scarring. Accurate diagnosis requires a detailed history, assessment of visual acuity and refraction, slit-lamp biomicroscopy, fluorescein staining and, where indicated, corneal topography, tomography, pachymetry, tear-film evaluation and microbiological investigations. Among these conditions, keratoconus and dry eye disease are particularly important because they can significantly impair visual quality, affect contact lens tolerance, complicate refractive surgery planning and require long-term management.

1. Keratoconus

Keratoconus is a progressive, usually bilateral but often asymmetric, non-inflammatory corneal ectatic disorder characterised by progressive thinning and protrusion of the cornea, resulting in irregular astigmatism and increasing myopia. The normally smooth, regular corneal curvature becomes distorted, producing irregular refraction, reduced best-corrected visual acuity and higher-order optical aberrations. The disease commonly begins during adolescence or early adulthood and may progress over several years, although the rate of progression varies considerably. Important risk factors include a family history of keratoconus, habitual eye rubbing, atopy, allergic eye disease and certain genetic or connective-tissue associations. Eye rubbing is particularly important because repetitive mechanical trauma may contribute to disease progression. Patients typically present with frequent changes in spectacle prescription, increasing astigmatism, monocular diplopia, ghost images, glare, halos and difficulty achieving satisfactory vision with spectacles. In advanced cases, the cornea may develop marked thinning, Vogt's striae, a Fleischer ring and, occasionally, acute corneal hydrops due to a break in Descemet's membrane with sudden stromal oedema.

Diagnosis of keratoconus

The diagnosis is based on clinical examination combined with objective corneal imaging. Visual acuity assessment and refraction may reveal progressive myopia and irregular astigmatism, while slit-lamp examination can identify corneal thinning, a conical protrusion, Vogt's striae, a Fleischer ring and signs of scarring in advanced disease. Corneal topography and tomography are central to the diagnosis and assessment of keratoconus. Placido-disc topography evaluates anterior corneal curvature and may demonstrate asymmetric bow-tie patterns, inferior steepening or skewed radial axes. Scheimpflug or other tomographic imaging evaluates anterior and posterior corneal surfaces and pachymetric distribution, helping detect early or subclinical ectasia. Corneal pachymetry identifies the thinnest corneal point and assists in monitoring disease severity and planning treatment. Epithelial thickness mapping, biomechanical assessment and anterior-segment OCT may provide additional information in selected cases. Serial imaging using comparable devices and reliable-quality scans is important when determining progression. A single abnormal topography result does not necessarily establish progressive keratoconus; the diagnosis must be interpreted alongside refraction, examination findings, image quality and changes over time. Before refractive surgery, suspicious tomography must be evaluated carefully because corneal laser procedures can precipitate or worsen ectasia in susceptible eyes.

Management of keratoconus in Bhandari Starlfe eye hospital Ludhiana

The management of keratoconus depends on disease severity, documented progression, corneal thickness, visual acuity, corneal scarring and the patient's age and visual requirements. The two principal objectives are to provide functional vision and prevent further corneal ectasia. In early, stable disease, spectacles may provide satisfactory vision, although frequent prescription changes should prompt corneal imaging and assessment for progression. Soft toric contact lenses can be useful in selected mild cases, while rigid gas-permeable (RGP) lenses, hybrid lenses and corneal or scleral lenses may provide better optical correction in moderate or advanced disease by creating a more regular refracting surface. Scleral lenses are particularly valuable in irregular corneas and patients with poor RGP tolerance, provided that fitting, corneal clearance and ocular surface health are carefully monitored.

Corneal collagen cross-linking (CXL) is the principal treatment used to halt or slow documented progressive keratoconus. In the conventional epithelium-off Dresden protocol, the corneal epithelium is removed, riboflavin is applied to the cornea, and the cornea is exposed to ultraviolet-A radiation according to the validated treatment protocol. This induces additional collagen cross-links and increases biomechanical stability. Appropriate preoperative assessment of corneal thickness, endothelial health and disease characteristics is essential; standard protocols commonly require a minimum stromal thickness of approximately 400 microns at the relevant stage of irradiation, although specialised protocols may differ. Transepithelial or epithelium-on techniques and accelerated protocols are also available, but their indications and evidence of efficacy differ. CXL is primarily intended to stabilise the cornea rather than reliably eliminate spectacles or contact lenses. In selected patients, intracorneal ring segments may improve corneal shape and contact lens tolerance, but they do not reliably stop progression and are not suitable for every cornea. Topography-guided phototherapeutic or refractive procedures may be considered in carefully selected cases, often in combination with CXL, with strict attention to residual corneal thickness and ectasia risk. Corneal transplantation—deep anterior lamellar keratoplasty (DALK) when the endothelium is healthy, or penetrating keratoplasty in selected cases involving full-thickness disease or significant endothelial damage—is reserved for advanced keratoconus with severe visual impairment, central scarring, contact lens intolerance or other indications. Patients should be advised to avoid eye rubbing, manage ocular allergy, and undergo regular clinical and tomographic monitoring. Early detection and timely CXL are particularly important in younger patients because progression can be faster in this group.

2. Dry Eye Disease (DED) tratment in Bhandari Starlife eye hospital in Ludhiana

Dry eye disease is a multifactorial disorder of the tear film and ocular surface characterised by loss of tear-film homeostasis, tear-film instability and symptoms of ocular discomfort or visual disturbance. Inflammation, hyperosmolarity, ocular surface damage and altered corneal nerve function may contribute to the disease process. Dry eye is increasingly encountered in patients with prolonged digital screen use, contact lens wear, ageing, meibomian gland dysfunction, systemic disease and exposure to environmental irritants. It is important to recognise that dry eye is not simply a deficiency of tear quantity; abnormal tear composition, excessive evaporation, eyelid disease, inflammation and neurosensory dysfunction can all contribute. The two broad and frequently overlapping categories are aqueous-deficient dry eye, in which tear production is inadequate, and evaporative dry eye, commonly associated with meibomian gland dysfunction (MGD). Patients commonly report burning, irritation, foreign-body sensation, redness, watering, fluctuating vision, photophobia and eye fatigue. Some experience symptoms that worsen during prolonged reading, computer work or air-conditioned environments. Reflex tearing can occur in response to ocular surface irritation, so watering does not exclude dry eye disease.

 

Diagnosis of dry eye disease at Bhandari Starlife eye hospital in ludhiana

A structured clinical assessment is essential to distinguish dry eye from allergic conjunctivitis, blepharitis, infectious keratitis, exposure keratopathy and other ocular surface disorders. History should include the duration and severity of symptoms, screen exposure, contact lens use, environmental triggers, medication history, previous ocular surgery, systemic conditions such as diabetes and autoimmune disease, and symptoms of dry mouth or other features suggestive of Sjögren syndrome. Validated symptom questionnaires, such as the Ocular Surface Disease Index (OSDI) or Dry Eye Questionnaire-5 (DEQ-5), help quantify symptom burden and monitor response to treatment. Slit-lamp examination should assess tear meniscus height, tear-film quality, conjunctival hyperaemia, corneal and conjunctival staining, lid-margin abnormalities, meibomian gland orifices, gland secretion and blink completeness. Fluorescein tear break-up time (TBUT) evaluates tear-film stability; a shortened TBUT suggests instability, although interpretation depends on technique and clinical context. Non-invasive TBUT can be useful where available. Schirmer testing assesses aqueous tear production, while tear-film osmolarity, meibography and other specialised tests can help identify the underlying subtype. Fluorescein and lissamine green staining can demonstrate epithelial damage and its distribution. Meibography identifies gland dropout and structural changes, but findings should be interpreted alongside gland function and clinical signs. The diagnosis should integrate symptoms and objective evidence of disrupted tear-film homeostasis rather than rely on a single test. Marked symptoms with minimal surface findings may warrant evaluation for neuropathic ocular pain or other diagnoses

Management of dry eye disease at Bhandari tarlife eye hospital in Ludhiana

The treatment of dry eye should be individualised according to severity, predominant mechanism and associated ocular surface disease. Initial management generally includes patient education, reduction of environmental triggers, regular breaks during prolonged screen use, complete blinking, avoidance of direct airflow from fans or air conditioners, and adequate management of eyelid hygiene. Preservative-free artificial tears are often preferred in patients requiring frequent instillation or those with significant ocular surface disease. Lubricating gels or ointments may be useful at night, although temporary blurring can occur. In evaporative dry eye associated with MGD, regular warm compresses and gentle lid hygiene can improve meibum flow; persistent disease may benefit from clinician-directed meibomian gland expression, thermal pulsation or intense pulsed light (IPL) in appropriately selected patients. In aqueous-deficient disease, treatment may include tear supplementation, tear conservation with punctal plugs in selected cases after inflammation has been addressed, 

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