Diagnosis

Diagnosis

Tests and procedures that may be used to determine the cause of dry eyes include:

6.1. Patient History and Symptom Evaluation

A detailed medical and ocular history is essential, as subjective symptoms do not always correlate with objective findings.

Symptom Questionnaires:

Tests and procedures that may be used to determine the cause and severity of your dry eyes include: a symptom questionnaire, such as 

Ocular Surface Disease Index (OSDI) may be used to quantify severity.[29] . The questionnaire uses three subscales to assess dry eye symptoms: Ocular symptoms (e.g., dryness, grittiness, irritation) Visual-related function (e.g., difficulty reading, driving, or using screens) Environmental triggers (e.g., air conditioning, wind, low humidity). Your score helps your doctor understand whether your dry eye is mild, moderate, or severe. It is accessible through

https://www.isd-de.org/news/osdi-dry-eye-questionnaire/

Dry Eye Questionnaire (DEQ-5) consists of five questions that assess the following: [29, 30] Frequency of watery eye, discomfort, and dryness. Late-day discomfort and dryness intensity. The overall DEQ-5 was calculated by summing the scores on the individual questions. The maximum score that can be obtained on the DEQ-5 questionnaire is 22. It can be accessed through

https://share.google/uR7Uqc8RQvqURwoWZ.

The Contact Lens Dry Eye Questionnaire (the CLDEQ-8) score [31] consists of: Frequency plus late-day intensity of dryness, discomfort, and "blurry vision" Frequency of "closing eyes to rest them" and "removing contact lenses to relieve discomfort". It can be accessed through

https://share.google/s75SbogXA0pAVj4XG.

History Includes: [32]

  • Onset and pattern of symptoms (burning, grittiness, blurred vision)
  • Systemic diseases (e.g., autoimmune, hormonal disorders)
  • Medications (antihistamines, antidepressants, isotretinoin)
  • Environmental and occupational factors (digital screen use, air conditioning)

6.2. Clinical examination

Impairment of tear film quality or changes in its composition can result in dry eye disease, which is categorized as either aqueous-deficient dry eye (ADDE) or evaporative dry eye (EDE). The TFOS DEWS II Diagnostic Guidelines and major ophthalmological societies recommend the following assessments. [33]

6.2.1. Assessment of tear stability

1.Tear film breakup time (TBUT)

  • The Tear Breakup Time (TBUT) is the duration between a complete blink and the onset of the first break in the tear film. [33, 34]
  • This measurement is most commonly conducted in a clinic using a slit lamp microscope, typically after applying sodium fluorescein dye.

2.Non-Invasive Tear Breakup Time (NIBUT)

  • It can be measured without fluorescein. This method is more commonly used in clinical practice.

6.2.2. Assessment of tear volume
3.Schirmer test

  • Your eye care specialist may measure your tear production using the Schirmer tear test. In this test, blotting strips of paper are placed under your lower eyelids. After five minutes, your eye care specialist measures how much of the strip is soaked by your tears.

4.Phenol Red Test

  • Another option for measuring tear volume is the phenol red thread test. In this test, a thread impregnated with a pH-sensitive dye (tears change the dye's color) is placed over the lower eyelid, wet with tears for 15 seconds, and then measured for tear volume.

6.2.3. Ocular Surface Assessment

  • A test to determine the quality of your tears. Other tests use special dyes in eye drops to assess the condition of your eye surfaces. Your eye care specialist looks for staining patterns on the corneas and measures how long it takes before your tears evaporate, such as Fluorescein Staining, Lissamine Green Staining, or Conjunctival Redness [34, 35].

6.2.4. Tear Film Assays

5.Tear Film Osmolarity

  • This type of test measures the composition of particles and water in your tears. With dry eye disease, there will be less water in your eyes. [33]

6.Tear markers

  • Tear samples to look for markers of dry eye disease, including elevated matrix metalloproteinase-9 or decreased lactoferrin.

6.2.5. Assessment of the lipid layer integrity and meibomian gland dysfunction (MGD) obstruction

  • Since meibomian gland dysfunction (MGD) is a common cause of chronic dry eyes, it's important to assess the meibomian glands to determine if they are healthy, blocked, dilated, or atrophied. [36]