Janet Castrillo O.D.

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Janet Castrillo O.D.

Optometrist with focus in specialty contact lenses. Managing
Keratoconus, Dry eye and Myopia Control

05/05/2025

Macular OCT: small scan, big impact.
From subtle fluid to early atrophy, OCT gives us a window into the neurosensory retina that clinical exam alone can’t match. Whether it’s unexplained vision loss, diabetic screening, AMD monitoring, or macular hole suspicion — OCT is your best diagnostic ally.

Key reasons to perform a macular OCT:

Unexplained central vision changes
Monitoring diabetic macular edema
Detecting early AMD or CNV
Assessing for vitreomacular interface disorders (ERM, VMT, macular hole)
Pre- and post-injection or surgical evaluation.

01/05/2025

Neovascularization of the iris (NVI) — an early sign of serious posterior segment ischemia. Think CRVO, PDR, OIS. Early detection is key to preventing neovascular glaucoma. Always investigate the systemic and retinal cause.

17/04/2025

Treatment for Metallic Foreign Body in the Cornea

1. Immediate Action:
- Don’t rub the eye or try to remove it yourself.
- Lightly cover the eye and seek medical help right away.

2. In-Office Treatment:
- An eye doctor uses a slit lamp to locate and assess the object.
- After applying numbing drops, the metal is removed with a swab, needle, or burr (for rust).
- A rust ring, if present, is cleared with a special tool.
3. Aftercare:
- Antibiotic drops/ointment to prevent infection.
- Possibly cycloplegic drops for pain.
- Follow-up to check healing.

4. Watch for Complications:
- Infection, vision changes, scarring, or corneal ulcers. Seek emergency care if symptoms worsen or vision declines.

16/04/2025

A clinical reminder: Preservative-free drops are essential for patients with chronic dry eye, post-surgical care, or preservative sensitivity. However, without antimicrobial agents, they pose a higher risk of contamination. Emphasize the 24-hour usage window and proper disposal of single-use vials to ensure patient safety.

24/03/2025

Ever wondered about the fit of your scleral lenses? 🤔 Scleral lenses are custom-designed to rest on the ‘white’ part of your eye (the sclera) rather than directly on the cornea. This provides a stable, comfortable fit and creates a cushioning effect that helps with dry eyes, irregular corneas, and other conditions. 🌟

The visual indicator (that tiny dot you see) helps ensure proper alignment, allowing for accurate fitting, better vision, and more comfort. Getting the right fit is key—too tight or too loose can affect both comfort and clarity. When properly fitted, scleral lenses can improve vision for patients with conditions like keratoconus, post-surgical corneas, or severe dry eyes.

Remember, proper lens care and regular follow-ups with your optometrist are important to keep your eyes healthy and your lenses working at their best! 👁️💧 ”

21/03/2025

Experiencing eyelid irritation? 🤔 It could be caused by a variety of conditions, and an eye exam is key to identifying the root cause. Common culprits include:

👁️ Blepharitis – Inflammation of the eyelid, often caused by bacteria or clogged oil glands.
🌿 Allergies – Seasonal or environmental allergens can cause itchy, swollen eyelids.
🦠 Infections – Conditions like styes or chalazia can cause redness, swelling, and discomfort.
⚡ Contact Lens Irritation – Improper lens care can lead to irritation or dryness around the eyelid.

If you’re experiencing persistent eyelid discomfort, it’s important to consult your optometrist to get to the bottom of it and receive the right treatment. Your eyes deserve the best care! 👁️💙 ”

20/03/2025

Flipping the eyelid during an eye exam is a crucial step in ensuring your eye health. 👁️✨ It allows your optometrist to check for any hidden issues like conjunctival abnormalities, foreign objects, or early signs of infection that might not be visible from the outside. This simple maneuver helps catch potential problems early, so your eyes stay healthy and comfortable! Don’t skip it during your next eye exam. 🩺 ”

13/03/2025

Keratoconus (KC) is a progressive eye condition where the cornea thins and bulges into a cone shape, leading to distorted vision. It typically starts in the teenage years or early adulthood and can worsen over time.

🔹 Common Symptoms
✅ Blurry or distorted vision
✅ Increased light sensitivity & glare
✅ Frequent prescription changes
✅ Difficulty with night vision
✅ Halos around lights

🔹 What Causes Keratoconus?
While the exact cause isn’t fully understood, genetics, eye rubbing, and environmental factors may play a role.

🔹 How Is It Treated?
👓 Glasses & Soft Contacts – For mild cases
🔵 Scleral Lenses – Provide a smooth optical surface for better vision
🌟 Corneal Cross-Linking (CXL) – A procedure to slow or stop progression
🔄 Intacs (Corneal Implants) – Help reshape the cornea
⚕️ Corneal Transplant – For severe cases

💡 Early detection is key! If you or someone you know has worsening vision, frequent prescription changes, or any of the symptoms above, see an optometrist ASAP.

📌 Have questions about keratoconus? Drop them below! 👇

11/03/2025

Scleral lenses are specialty contact lenses that vault over the cornea and rest on the sclera (the white part of your eye). One key area for a perfect fit is the landing zone—where the lens meets the eye.

🔹 What is the Landing Zone?
The landing zone is the outermost part of the scleral lens that contacts the sclera. It plays a crucial role in lens stability, comfort, and eye health.

🔹 Why is the Landing Zone Important?
✅ Ensures even weight distribution for comfort
✅ Prevents excessive pressure on the sclera
✅ Helps maintain proper lens alignment
✅ Reduces risks of redness and irritation

🔹 Signs of an Improper Landing Zone Fit
🚨 Blanching (compression of blood vessels) = too tight
🚨 Edge lift or fluting = too loose
🚨 Redness or discomfort = possible misalignment

04/03/2025

Struggling with an itchy, swollen eyelid? It could be blepharitis! This common condition causes inflammation along the lash line, often leading to styes. Keeping your eyelids clean with warm compresses and gentle cleansing can help keep flare-ups under control.
What Causes Styes?
Styes are often caused by blocked oil glands along your eyelid? These little bumps can be painful but usually clear up on their own. To prevent them, practice good eyelid hygiene, avoid rubbing your eyes, and always remove makeup before bed.
Got a stye? Try this: ✔️ Apply a warm compress for 10-15 minutes, 3-4 times a day. ✔️ Keep your eyelids clean with a gentle cleanser. ✔️ Avoid squeezing or popping the stye—it’ll only make it worse! ✔️ Toss old eye makeup and avoid sharing products.  ”

26/02/2025

Corneal topography is an eye test that charts the landscape of your cornea. It’s quick and painless, and nothing touches your eye.
The test produces a series of color-coded maps that your provider uses to diagnose and manage various eye conditions.
Corneal topography is an essential part of pre-operative planning for LASIK and other surgeries. It is also very important for diagnosis of keratoconus and hard lenses fitting.

25/02/2025

An iris nevus is a collection of pigment cells in the iris. While most are harmless, some can develop into melanoma over time, which is why routine eye exams are so important. Protect your vision! Your eyes can reveal more about your health than you think! Iris nevi are usually harmless, but getting them checked can help detect any rare complications early.
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